To make and run variations on Ned (on a Pentium or SGI), copy over to your own system the following files: demo.*,demo1.*,improv.zip.
To run Improv, you must install the latest version of the CosmoPlayer plug-in (available from www.sgi.com). You can make changes to Ned by editing demo1.java On an SGI, be sure to add to your CLASSPATH: /usr/CosmoPlayer/classes:improv.zip:/usr/local/lib/netscape/java_301 . Then you can run: javac demo1.java to compile.