My Ideas File

I have lots of ideas. While it is undoubtedly true that some of them are better than others, it can safely be said that no one of them is worse than all of them.

Universal Decompression Language
Jim Blandy once made the interesting point to me that the way to
specificy a compression program is simply to specify its format --
that is, how to decompress it.  The format also a strong,
though not definitive, hint toward the compression algorithm.

Now, that leads to a really wild thought: what if you had a tight
little language, a kind of byte-code, for describing how to decompress
a file?  That is, a compressed file would be program in this language,
only most of the bytes of "program code" would really be data bytes.
But every now and then there'd be a byte sequence saying "go back 200
bytes and take the next 30 bytes from there" and stuff like that.  All
decompression programs would therefore be the same program (!), namely
an interpreter for this language.

The point is that by thinking of the compressed format as a language,
the format could become totally independent of the algorithm used to
create the file.  Assuming the format were well-enough designed to
specify any sequence of expansions, backtracks, whatever, then any
program that could produce files in this format would be a compressor.
Whether a good compressor or not would be up to the authors, but
there's no reason for the format to restrict the compression ratio.

You'd have to know a lot about compression algorithms to design a good
Universal Decompression Language, that's for sure.  If you knew what
sorts of instructions come up in current compression formats (they
are, after all, already languages, and their decompressors are
interpreters), then you could probably do a good job.

Anyone feel like having a go at it?  Jean-loup?

Library Monster (automagically detects mis-shelved books)

A Device to Automagically Detect Misplaced Books on Library Shelves.
[ by Karl "Get Rich Quick And Then Eat Out Forever" Fogel ]

        It's a waste of time for humans to have to worry about
mis-shelved or lost books in a library.  The task of detecting
misfiled books can be wholly automated.

        First, insure that each book has a bar-coded Dewey decimal
number label on its spine.  All books need to have their labels at
approximately the same height from the shelf (from the bottom of the
book).  Somewhere near the base is probably best.

        Next, a track (like a monorail train track) running the length
of the shelf is installed.  It can be partially hidden underneath the
shelf if it is deemed unsightly, but it must run the full length of
the shelf.

        To detect if there are any out of order books on the shelf, a
barcode-reading device runs along the track, going from one end of the
shelf to the other, and it scans at the height of the labels on the
book spines.  It has some simple computational ability (or perhaps it
communicates with a smarter device somewhere), and signals whenever it
encounters an out of order book.  If it's smart enough, it can
probably be programmed to save its state as it is manually transferred
to the numerically next shelf (or maybe the tracks can be designed to
lead to the next shelf, until an aisle needs to be crossed).  If it's
a little smarter than that, it can be programmed to stop on certain
Dewey numbers and emit a different signal; this way, librarians can be
searching for books reported as lost while also insuring that the
shelves are in order.

        While tracks are needed on every shelf for this to work, each
library will only need one or two of the actual reading devices, since
there's no need to scan all shelves simultaneously.

-*- -*- -*- -*- -*- -*- -*- additionally -*- -*- -*- -*- -*- -*- -*-

        It's probably a good idea to give the reader some smarts (or
have it communicate with something smart), because it can be used for
all sorts of statistical analyses of the library's collection while it
checks the shelves.  The reading window should also have adjustable
height, in case some shelves simply cannot have the track at the
optimum location, or have oversized books (although technically that
shouldn't matter), whatever.  For places where no track is available
at all, it should operate as a handheld device, coping with the
uneveness of human movement.  This should not be difficult, since the
library scanners at the circulation desk already seem to cope with

social operating systems

If directories are like folders or rooms, why is it that when you
enter them you can't see who else is there?  How about an operating
system that shows you who (or whose processes) are active in the
current directory, perhaps by providing a [WHO] button or cluster in
the GUI.

Computers are as much communication devices as anything else these
days.  They shouldn't hide other peoples' presence unless asked to.

file action hooks in operating system

I'd like to be able to run a program (a "hook") whenever a file
changes, without polling.  This way CVS could transmit diffs on
commit, because the first time a file in a working copy got modified,
CVS would be "hooked" into saving a pristine copy somewhere (under
CVS/, probably).  Come commit time, it can diff the modified copy with
the pristine copy and just send the diff.  This does not double
storage requirements (like the usual diffcommit scheme), because only
modified files need pristine copies saved.

The Linux kernel could do this...

Diff and Zip all in One Program

ask me about this

The Ultimate Safe Diary

        Suppose you have ambitions to a political career, but also
want to keep a diary.  Recent events make it clear that your diary
could be subpoenaed at some point by a hostile Senate Judiciary
Committee.  What to do?  Merely encrypting it and keeping the key to
yourself won't work, as they can subpoena the key just like they did
the diary.  Yecch.  Do you really like the idea of Alfonse D'Amato
having any encryption key of yours?  I didn't think so.

        A solution, of sorts: encrypt each entry and *throw away* the
key -- relying on Moore's Law and advances in decryption techniques
that hopefully will make it possible for you to decrypt your diary
about the time you retire and wish to write your memoirs.

        This technique is not recommended for control freaks.

A media correction clearinghouse (FED)

Subject: now, *this* I don't have time for, right?
--text follows this line--
        I had an idea last night.  Remember how you told me that you
saw Noam Chomsy speak, and he gave examples of such egregiosity as the
NYT wildly mistranslating Arabic signs at a demonstration, right?
Well, I was thinking that the Net is a really fine distributed
proofreading system, and for each blatantly wrong fact that shows up
in the media, there's probably at least one person on the Net who
noticed it and is qualified to correct it -- if only there were a
centralized collector and distributor of corrections that they knew
people could consult.  Nobody has to do too much work, just send off
some mail when they happen to see an error in their "field of
expertise".  Important omissions in the news could be reported too,
but the line there is fuzzier and it might be good to make a separate
section for those.

        I'd like to start such a service.  The World Wide Web would be
a good place to put it; you could have hyperlinks associated with each
article, showing the submitter(s) of the correction (those who want
their names used, at least).

        It could be available by mailing list as well, in which case
the submitters would be listed right with the blurb, or maybe in a
separate section at the end if there are too many per blurb.  Needless
to say, automatic tools would do most of this maintenance... and I'd
have to learn about mailing-list software and write the tools,
probably, mmmm...

        Here's a sample first "page" of _The Free Electron_:

 -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*-
                ** The Free Electron (Daily) **

1. Arabic Sign Mistranslated
   (NYT, April 17 199x, page A1, photo at upper right)
   The placard being held by the demonstrator in the center of the
   photo says "Freedom for Journalists", not "Long Live Our Ruthless
   Dictator" (which the NYT claimed in the caption below).
2. China's Foreign Debt Higher Than Claimed
   (The Economist, May 32, 199x, page 60, right hand side.)
   China's total foreign debt is actually 100 billion dollars (800
   billion yuan), not the 100 million dollar figure offered by The

3. UN Population Proposal Veto by US Ambassador Not Mentioned
   Most newspapers and television news stations, in their reporting on
   the UN convention on population control, failed to report that
   James Farright (US ambassador to the UN) again vetoed a measure
   that would have supplied contraceptives to women in developing
   nations.  The contraceptives proposed included the so-called
   "abortion pill".

[etc, etc]

  Neither the editors, the contributors, nor the distributors of
  this document make any guarantees regarding the accuracy of any
  statements contained herein.  Readers with questions that are not
  answered by the summaries are urged to contact the appropriate
  submitter(s), not the editors.  For subscription information, send
  electronic mail to BLAH, with FOO in the subject header or first
  line.  Issues are also available on the World Wide Web, Anything else we need to say to avoid legal
  responsibility for the allegations herein, please consider to have
  been said. 
 -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*- -*-
        I'm more comfortable with numbers 1 and 2... number 3 is
pushing it, but on the other hand it is important that certain things
get mentioned.  Just have to make sure that the service doesn't get a
reputation for slanting toward certain kinds of omissions, because in
the minds of some we Netters are all left-wing libertarian types who
see conspiracies everywhere.  I don't mind that reputation except that
there is a grain of truth in it, and one would have to be careful not
to favor certain flavors of submissions.  But I think that can be
worked out, and anyway, factual corrections can be put in a different
section from the other stuff.

        What do you think?


A Prediction-Checking Web Site

Lots of people make predictions -- economists, sociologists,
politicians...  These predictions are rarely checked for accuracy
later.  What if we had a server where people could register
predictions (made by themselves or other people) along with a date to
check back.  People can register for auto-notification; on or just
before that date, email will be sent to the original poster and all
the registrees.  The poster can go back and state whether in her
opinion the prediction has come true, and other people can leave
agreements, disagreements, or general comments about it.

Wouldn't it be nice to see, for example, how often the General
Accounting Office is right about the costs of some new law?

Probably wouldn't hurt to get a statistician to make sure predictors
are cut as much slack as they ask for (i.e., margins of error).

Digital Notary (now done commericially by someone else)

From kfogel Mon Apr 18 19:52:30 1994
Status: RO
Message-Id: <>
From: kfogel (Karl Fogel)
Cc: kfogel
Subject: dating service
Date: Mon, 18 Apr 1994 19:52:28 -0500

        It would be interesting to run a trusted dating service, where
people mail text and the dater sends it back encrypted according to a
combination of the date and some private key known only to the
date-stamper.  If you mail the date-stamper some of its own output,
along with the date it was claimed to have been stamped, it would
verify that.  Probably the plaintext date would be part of the format
of the output; no reason why not, if the cryptographic function is

        Like a bank's safety deposit box (but cheaper), this would
provide an objective verification that someone had a certain piece of
information on or before a certain date.  This assumes that the dating
service is trusted, but people seem to do all right with the anon

        Boy, I'm just full of ideas lately.  Wish I had more time...

From: Jim Blandy 
To: Karl Fogel 
Subject: Digital notary
Date: Wed, 22 Mar 1995 19:55:44 -0500

Remember your dated idea?  Check out:
    Science News
    March 4 1995
    Vol. 147, No. 9
    Page 138

It's done by Stuart Haber and W. Scott Stornetta, both at Bellcore in
Morristown, NJ and Surety Technologies in Chatham, NJ.

[ See for more.  -Karl ]

prime server

From: Karl Fogel 
Subject: primed
Date: Mon, 13 Feb 1995 19:58:34 -0600

        No, that's not a verb in the past tense.

        If there are lots of applications which make use of prime
numbers, it's silly to have them all re-computing the same primes over
and over.  Wouldn't it be nice if everyone could share the primes
they'd already found, and annoying duplication of prime-generation
code were avoided?

        /usr/lib/primed would be started up at boot time.  It would
contain a prebuilt table of the most commonly needed primes (those
within the range of unsigned int, probably), and thereafter cache any
primes it generates (and of couse it can use them in the generation of
new primes).  It would be smart about keeping track of whether or not
its list of primes has any holes... maybe it could spend its spare
time filling the holes and/or leisurely generating new primes.

        Any program needing a prime would just query primed.  We can
work out an entire, needlessly overblown protocol for prime requests:
give me your highest available prime, all the primes from NUM1 to NUM2
(inclusive/exclusive, in all combinations), tell me if X is prime,
feed me your longest contiguous list of primes, just give me
everything you've got, give me any random prime...

        Imagine all the savings we'd get from primed.  No more looking
through dusty books to see if you can do any better than testing
against the first few primes, then taking the square root and dividing
by every other integer.  No more duplication of the same tired old
code among ten different application wanting to resize their hash
tables.  With primed, you can always be assured that the very latest
in prime technology is working for you, that your primes were
generated as efficiently as possible... or, at least, as efficiently
as the author of primed knows how to generate primes.

-Karl, who is not learning how to use the GMP library when he should
       be working on a gene sequence editor.

math question

hmmm... what happens when you take the same number, N, in several
different bases and add its digits?  What patterns emerge?

Time for some scheme code...

Topology of the WWW

From: Karl Fogel 
Subject: topology of the WWW (this is not humor, just me rambling)
Date: Sat, 11 Nov 1995 01:25:21 -0600

        It occurs to me that the Web has a certain topology, one that
can be described more specifically than just "lots of pages with lots
of links to other pages" :-).  Topics often seem to "cluster".  That
is, the pages devoted to a particular topic all have a tangle of links
pointing from one to another, producing many cycles.  On the other
hand, we have "gateways" into these clusters, these being pages which
link to a cluster member but are not linked back to by many pages in
the cluster (define "many" any way you want, it's all very vague

        Since one can probably start from any page on the web and find
a cycle back to it eventually, the distinguishing characteristic of
the clusters must be the shortness of the cycles in them.  It's
certainly not necessary that they be direct A <---> B cycles (there's
some technical term for this, right?)... in fact, in the particular
topic that made me think about this, Chinese language related pages,
there are many examples of slightly longer cycles which do confine
themselves to the topic (i.e., A --> B --> C --> A, where A, B, and C
are all exclusively devoted to Chinese language stuff).

        A page can be a member of multiple clusters, of course, which
makes this all a little hard to visualize in three-space.  And I'm not
totally convinced yet that the topic-specific cycles are really
automatically distinguishable from (i.e., usually shorter than)
just-there cycles, because I always have the crutch of being aware of
the topic when I notice cycles.

        Some things to ponder are:

1. Are there any biological structures which have a similar topology?
   (Brain?  Maybe the liver?  I don't know enough...).  If so, is the
   topology an important part of that structure's function?

2. Are there other things in nature (non-organic) which are like this?

3. Would it be possible for a web-bot to crawl around gathering
   statistics about clusters?  If so, could the results be realized
   graphically in a useful way?  Could a broad "topic map" of the Web
   be made?
   [ Answer to first question is almost certainly "Yes", of course.  I
     don't think it's necessary that the bot know when it's "on a
     topic"... in fact, it's probably better that it *can't* tell. ] 

A real Life program, when I get time

        The Perfect Life Program has not been written yet.  Xlife has
zippy algorithms, but a less-than-ideal interface.

A good life program & interface would have:
  - clear obj (clears everything touching CELL)
  - run  undo (back-to-last-initial-state)
  - edit undo (undo recent edits, as in de-"clear obj")
  - load & save, of course
  - rotate obj
  - every five gridlines highlighted (like graph paper)
  - (optional) when turn on or off a cell, thin line over all other
    cells in that row, col, & diags, so user can easily sight long
  - infinite universe, of course
  - zoom & swivel
  - oases (cute, but not deep)
  - gardens of eden (deep, but not cute)
  - a library of common objs (see ~/etc/life.patterns)
  - gridlines optionally off (at run-time)
  - a collision explorer (as Jim described)

The Encryption Program I Want To Write

        I'll have to read most of Schneier before I can do this, but:

1. It encrypts messages according to a key, which must be prearranged
   with the intended recipient (and hopefully with no one else!).
2. The algorithm uses variable-length keys (the longer the stronger).
3. It calculates the key from a plaintext passphrase.  The longer the
   passphrase, the longer the key, the longer the key, the stronger
   the encryption.
4. It would be nice if snatches of English text were as likely as
   random garbage text to generate good keys, but this is not a
   design requirement.  Depending on the algorithm, the question of
   "good" keys vs. "bad" keys may not be very relevant.

        To encrypt a message, invoke the program on the message,
typing the passphrase when prompted.  The program does the rest,
calculating the key from the passphrase according to some
deterministic algorithm by which the same passphrase always produces
the same key.  It writes the ciphertext to file or stdout as desired.
Neither passphrase nor key ever exists on disk (unless you choose to
be that insecure); the cleartext need never exist on disk either if
you're really paranoid.  All memory is carefully zeroed.  I can't do
anything about swapping, but you can limit its likelihood by
controlling how much real memory you have and how much of it is used
by other processes.

        The program decrypts the same way -- invoke it on the
ciphertext, type the passphrase when prompted, and read the plaintext
on stdout (or in a file if you explicitly ask).

        As you can see, there is nothing revolutionary about this.
It's good old-fashioned encryption.  The reason I want it is that it's
USEABLE -- I can send my friends reasonably secure messages without
thinking too hard, as long as they know the passphrase too.  I don't
know of any equally useable program out there.  PGP can do
conventional encryption, but it's unwieldy (IMHO) and still stores the
key on disk (albeit encrypted with its own passphrase).

        I want this encryption program because I might actually use
it.  It should be as secure the algorithm and key are -- there is very
little to attack in the protocol.  You know a passphrase, your friends
know it, and therefore you can all send secure messages.  That's it.
There are no confusing key-management techniques or "trust" networks
to maintain.  Of course, it can't protect against someone snooping
your keystrokes (or network-sniffing, if you're typing across a LAN),
but then nothing can protect you against that.

        It doesn't do digital signatures, or allow you to converse
with strangers.  This is okay -- sometimes it's less important how
many things a product can do than that it do well what things it does
do.  Like that last sentence, for example.

hypertext locator (keeps you on track)

        I hate the lost-in-hyperspace feeling that often comes so
quickly when reading a hypertext document or browsing through a
hyperlink universe.  What I want is an actual *map*, that shows me
where I am in relation to everything else.  (If everything else is too
much, maybe it could just show me where I am in relation to where I've
already been.)

        I want the map to be visible at all times, but not so large
that it obscures a lot of my viewing area.  One solution is to to have
it occupy a little xbiff-sized area off in a corner.  The outline of
the hyperstructure would be clear from looking at the map, and my
current location would be highlighted in red or something, but none of
the node names would be legible at that resolution.

        In order to see the map more clearly, I'd click on it -- the
mouse buttons would have somewhat the same effect they do in xdvi,
zooming into the map so I could read the node names and follow the
connections clearly.  However, the behavior would be slightly
different.  In xdvi, you never affect anything by clicking on the
document; you just get different levels of zoom.  I want to be able to
use the map for travel as well as navigation.  So maybe it should
behave like this:

        (Let's assume one mouse button for simplicity's sake).  Click
on the map and get a larger, zoom-window over that area (if you want
to see the area where you currently are, you'll just have to click
over it).  Once the zoom-window pops up, however, the mouse pointer
suddenly takes on a new role.  It becomes a crosshair that is capable
of jumping you to a new node.  Each time it is passed over a node, the
node highlights (meaning "release now and this is where you'll be").
So moving the mouse doesn't necessarily move the zoom-window (unlike
xdvi).  Instead, the zoom-window is dragged around whenever the mouse
pointer hits an edge, so you *can* still navigate over the whole map.

        Perhaps you don't want to change your current position -- you
just wanted to browse around the map.  Hmm, well, in that case, maybe
we should make a simple release not have any effect, but another click
while dragging would cause the node-under-pointer to be jumped to.
How would that work in a single-button-mouse universe?  Have to think
about this part of the interface some more, I guess.

        You could have a special command that meant "make this node be
root", to uncrowd your map and get a new viewpoint on things.

vague fuzzy database indexing idea, needs work

Fast Database Indexing: this needs to be fleshed out some more, but...

        The reason we don't index every column (i.e., invert on every
possible key) in a database is that maintaining the indices takes up
too much space.  The price of speed is space; that's why most systems
allow you to choose which attributes to index.

        If indices could be shared as far as possible, space might be
saved.  But discovering how the data can be shared usually requires
semantic knowledge about the database's contents, which allows a human
being to carefully construct the index-builders.  What if (like
automatically-generated Huffman tables and fractal compression) the
process of discovering what can be shared could be automated?

        Examine Sybase's patent for fast indices...

A real newsreader for Emacs (subprocess does dirty work)

From: kfogel (Karl Fogel)
Cc: kfogel
Subject: thought of the day
Date: Mon, 28 Nov 1994 10:52:37 -0600

        I am forced to use GNUS again, and am in severe pain every
step of the way, of course.  I'm unsubscribing from a lot of groups
that were born after the last time I read news, and I realized that it
would be very nice if GNUS took advantage of the heirarchical nature
of newsgroups.  For example, this:


        could be contracted to this:

       < ... >
       < ... >
       < ... >

        What does this remind you of?  The phylo browser, of course.
GNUS should probably even have some outside program that does the hard
work of getting newsgroups, sorting, threading, etc (maybe it does
now, but if so, it's slow).

        So, dream project for today is rewriting GNUS along a
phylo-browser model. :-)


Here's my suggestion to the Internic on how to solve the problem of trademark disputes in domain-names:

From kfogel Mon Jul  1 22:54:21 -0500 1996
From: Karl Fogel <>
BCC: Jim Blandy <>
Subject: Possible solution for trademark disputes?
Emacs: the road to Hell is paved with extensibility.

        My apologies for adding to your undoubtedly huge mail pile on
this subject, and I hope my comments are worth your time.

        I read today's New York Times article on the growing number of
domain name disputes involving trademarked names, and thought: there
might be a solution that makes the whole problem simply go away.

1. Create a new top-level domain (call it "r.") for holders of
   registered trademarks.  The domain request forms for this domain
   will make it clear that one can ask for domain "foo.r" only if one
   owns the registered trademark "foo".  The fact that the domain
   request form clearly spells out this condition should speed
   courtroom resolution of any conflicts that still arise.  Internic
   might charge extra for registering such domains and perform the
   trademark verification itself, even.

2. Create another new top-level domain (call it "alt.", after Usenet),
   which is run on absolutely a first-come, first-serve basis, and the
   domain request form will make this clear, too.  It would
   (presumably, though the courts have final say in this) be okay to
   register someone else's trademark in this domain, since the FQDN
   itself would make it clear that the owner of the domain is not
   necessarily the owner of the trademark.  The public would catch on
   pretty quickly and be able to distinguish identities, which is the
   main purpose of trademarks anyway.

3. Existing .com domains would not have to change, and I suppose
   existing legal disputes would have to be settled somehow (hopefully
   some of the participants would simply agree to use the new
   domains).  Whether .com would continue to accept new domain
   requests, and if so under what policy, is a question I haven't
   thought much about... Hopefully, companies won't get some silly
   idea that having a ".com" domain implies some sort of ground-floor
   cachet that ".r" or ".alt" wouldn't have.  However, I am hopeful
   that most are more sensible than that, and realize that the
   important thing is that people know how to find them, a property
   which this scheme preserves.

        That's the plan in a nutshell.  Details have to be mulled
over: for example, I don't even know whether trademarks are an
international namespace or mainly a US namespace.  But the general
idea is that this kind of problem can be solved by creating a few new
top-level domains.

        I hope this suggestion is helpful.

Good luck,
Karl Fogel <>

rm -r in dired (more elisp/dired stuff)

also, how rm -r in dired?  Dang it, it should be a real shell almost...

stuff I really want time to read

read Asimov's "The Genetic Code", read Szekely's "From DNA to
Protein", read Knuth, excurse in Robert Young's "Excursions in
Calculus", learn calculus right.  Read some intro to chem books.

        Sheesh -- take a year off and read everything.

apropos an emacs fix

M-x apropos and friends ought to use buffer "*Apropos*", not the
*Help* buffer, because one wants to refer to the results of the
apropos in getting further help.

quickly find include files in Emacs

In C mode, a "open this include file" command.

completion (from buffer) in Emacs query-replace

dymamic completion in query-replace prompts.

X-Win Buttonbar Utility
make an xwin buttonbar utility that takes executable names as its
commline params, and icons if they exist. Allow a default icon
directory to be searched, too.

It would be started from .xinitrc or something...


make an XBillboard that can leave a message for other people to see on
your screen. Big Window, big font, but constantly changing -- can it
disable the screensaver?

pushd/popd for projects

now make pushd/popd equivalents for projects:
  pushd:  pops over to another project, pushing it to the
	  front of the list and going to it's default buffer/file
  popd:	  should we even have this? it's effect will be to bury the
	  project at the end of the alist.

helpers: one that moves PROJ to front of alist, and one for NTH proj
	 one that moves a file (we need a better name) within the proj
	 to the front. No other side effects in these, do everything else
	 afterward. i.e.: make a function that automatically uses the now
	 front proj, etc...

buffer rings in emacs (see also pushd/popd for projects

buffer rings!!!!! next-buffer-in-ring moves you to the next one in the
list: takes ring as arg: ring is usually a digit or something: like
registers: prefix args do the obvious: in Emacs 19, it will use C-c 1,

okay -- to implement the assocced buffer rings, just have each buffer
know which ones it is associated with.  Then successive C-c x's
display the ring circularly in the minibuffer.  When you reach the one
you want, hit RET and switch to buffer is called on it.  (see the
.mailrc for how to make emacs eval something as it finds a buffer).


X program for key-rebinding

An X program for rebinding keys & mouse buttons to WM functions, like
MSWINDOWS or the Mac do, instead of pharting around with little text
files that you need a Ph. D. to modify correctly.

PCP-based encryption algorithm

From  Wed Oct 16 06:46:54 1996
Received: from ([]) by (8.6.9/8.6.9) with ESMTP id GAA10742 for ; Wed, 16 Oct 1996 06:46:36 -0500
Received: (from kfogel@localhost) by (8.6.12/8.6.9) id MAA03771; Tue, 15 Oct 1996 12:23:50 +0800
Date: Tue, 15 Oct 1996 12:23:50 +0800
From: Karl Fogel 
Message-Id: <>
Subject: Karl: remember the PCP-based encryption scheme...
X-Windows: garbage at your fingertips.

        put this in your ideas file when you get back

        (why, that's almost as good as actually implementing it!)

Ever yours,
Wilkins Micawber, Esq.

make software match mental stack-pushing and -popping

`push' records buffer, file, and point so you can go off and fix the
bug in your debugger that you discovered while debugging another
program, and then fix the bug in your editor that you discovered while
debugging the debugger, and so on... and return from it all gracefully
without forgetting what you were trying to do in the first place.

maybe use `recursive-edit'?

Of course, one could just set a bookmark at a place and remember what
one was doing there.  Think about this.

(Back to Karl Fogel's home page.)