From: Robert Andrew Ryan <rr2b+@andrew.cmu.edu>
Newsgroups: comp.os.linux.announce
Subject: sxpc 1.4: A Simple X Protocol Compressor
Date: 20 Jan 1994 23:39:52 +0200
Approved: linux-announce@tc.cornell.edu (Lars Wirzenius)
Message-ID: <2hmtn8$d5i@klaava.Helsinki.FI>

sxpc 1.4: A Simple X Protocol Compressor

What's New
1.1 unix domain socket support, and support for machines without
TCP/IP
1.2 Minor changes to avoid problems with many sxpc processes being
started and left running when run from .login or .profile.
1.3 (unannounced, short lived) fix for broken 1.2, including
potential data corruption fix.
1.4 Minor fix for better support of POSIX systems, using POSIX
setpgid instead of SYSV setpgrp.

This program is intended to improve the performance of X applications
over a slow internet connection.  (e.g. slip, cslip, or term)
It assumes a Unix operating system at both ends of the link.
Compression rates of up to 90% are possible, while more typical rates
are between 30 and 80%.  Interactive performance is helped the most,
since the compressor works by storing recently transmitted sequences
of data.  (Overall compression rates with term compression and sxpc
are 10-20% better than term compression alone. Modem compression is
generally comparable to term compression.)

Why Not Wait for X11R6 and LBX?

Well, obviously sxpc is available now :-)  Also sxpc should work
with any version of X and does not require the recompilation
of clients or servers.  (LBX may not either, I don't know that
much about it.)  The drawback of course is that you can't use
sxpc unless you run unix on both sides of your network connection.

Where?

sxpc 1.4 may be obtained by anonymous ftp from atk.itc.cmu.edu (in
sxpc-1.4.shar.Z), or from ftp.x.org (in contrib/sxpc-1.4.shar.Z).

 WARNING WARNING  DANGER DANGER 
 If you use this program use xauth to provide SECURITY, since 
 host-based security will be BYPASSED. (See README.xauth for further
 information)

sxpc 1.4 is covered by a GNU-style copyright (and disclaimer).

-Rob Ryan (robr@cmu.edu)

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