Campuses:
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Several packages are in use within the department.
(this is also installed on most of our managed windows systems, and basic instructions for using it can be found here: xming)
An X11 server for Mac OS X can be downloaded directly from Apple.
You may also want to check out VNC, another remote-access system. If you intend to use it across the internet, rather than for local use within Tate Lab, you should read directions for SSH tunnelling, as the non-encrypted version is blocked at our firewall. Here are some HOWTOs on doing this: