Download (precompiled for Java 1.5, or the source) a Supdup-enabled version of the Java Telnet application. The original code is fairly easy to add plugins to, but so far I had to hardcode the use of the supdup terminal emulator, so this version is only useful for Supdup.
avoids idle (logged-in) disconnection by periodically sending a “keep-alive” to ITS.
supports the SAIL character set! Thanks MMcM!
To run, use
java -jar supdup.jar [hostname]
Note that the window can be resized, but the change only gets through to ITS at connection time (due to the Supdup protocol). Note also that you can use Ctrl+X for non-alpha X, e.g. digits, at least in Linux - it doesn't seem to work in Windows. Note also that you can use it as an applet, if your Java sandbox allows.
Things to do on a rainy day:
Java is a trademark or registered trademark of Sun Microsystems, Inc. in the United States and other countries. The Java Supdup author (Björn Victor) is independent of Sun Microsystems, Inc.