Need access to a local Linux computer via LAN

One brave sole (besides myself) is now using Linux (non-LTSP) desktop (RH8).
He seems to be doing fairly well but we do hit some bumps from time to time
requiring my attention. I could install VNC server on his desktop so I
could effect fixes from my machine. Is there a better way??? We are behind
a firewall so simplicity is more important than security.

Thanks

George