The usepty program is used to provide a pseudo-tty interface to a device
located on the HDS ViewStation FX.

To use it to access the "Serial 1" port on the ViewStation FX, use the 
following command:

	usepty /dev/ptyxx rsh FXhost opendev /dev/tty1 &

The 'usepty' process will repeatedly monitor the pseudo-tty and wait 
for a process to open the corresponding slave side.  When the slave side
is opened, it will execute the 'rsh' command to open the port on the
ViewStation FX.  When the slave side is closed, the 'usepty' process will
resume monitoring of the pseudo-tty.
