to use gcg through VNC
instructions

change vnc password: vncpsswd
start vnc server: vncserver
You should see "New 'X' desktop is siriusC:y"
ex: New 'X' desktop is siriusC:1
connect to http://gcgserver.umdnj.edu:5800+y/
ex: http://gcgserver.umdnj.edu:5801/
fill in your vnc password.
gcg
seqlab