If you want to to do more than just the command-line stuff that a remote
terminal gives you, you can "tunnel" other protocols. Please see man page
(man ssh) for how to. Here are some examples:
X11
You are supposed to be running X server before starting ssh session.
Simply add "-X" option with ssh command. The remote server will arrange
to set your DISPLAY variable to something that will cause the X protocol
to travel over your SSH connection; do not set the variable yourself!
If you want to run X apps on some other Sun at PARC, simply ssh to the
other machine (our Unix-based ssh automatically does the X forwarding
for you). Again, don't set the DISPLAY variable yourself
HTTP
You can make your web client use the PARC proxy server to get to PARC internal
web pages from outside PARC. This can be done by forwarding local port to
remote host's port.
In your web browser, tell it to use a proxy of localhost
port 8000 (or whatever local port you picked). In
Netscape, this is Edit | Preferences | Advanced | Proxies | Manual proxy
configuration; in IE, it's Tools | Internet Options | Connections, then
click the Settings button for whatever connection you're using.