for windows we will have the user interface in tcl running under
regular wish8.0

It will start up and then fork off a maxima, and will listen
for a connection from it.

It will send back its 'cygnus' pid.   This can be used to invoke
the 'cygnus kill.exe' on the maxima process...

If the kill -INT from the shell is too slow, we can have a third
little process waiting to do this job, with a socket open from wish