The server sits on a port and listens for commands to send to working
model 2D.  It must run on a windows machine that has the neva DDE
stuff installed.  An installer for it can be found in the lib
directory; it's called 'dde.exe'.  To run the server modify
the server-properties.prop file in the rec/mod directory.  And then
run:

java -cp server.jar mod/server-properties.prop

Then on the (presumably linux) client edit the system_properties.mod
file to get the right settings for the server:
  SystemProperty WM-server-host "gray-duck.ai.mit.edu"
  SystemProperty WM-server-port "6235"
  SystemProperty WM-server-basic-dir "c:\\hal\\source\\rec\\wmbasic"

The one for the WM-server-basic-dir should be on ther server side but
the client is generating the code so it needs to know where it will be
on the server...  Doh!

Then run java -classpath ".;rec.jar;lib" rec.ui.RecSystem sim-server.ini