Remote X:
The supported method to have X programs on other machines run on the machine you are at is using SSH tunneling. SSH tunnelling is a newer method to allow access to remote X applications. SSH tunnelling offers a number of benefits over the traditional method of exporting the display, such as the encryption of all data and the lack of a need for advance setup.
Using ssh tunnelling
On the computer you are at, type:
$ ssh -X remotemachine
Once connected to the remote machine, simply type in the name of the X application that you wish to run. The graphical display will automatically be forwarded to your local machine.
Replace remotemachine with the name of the remote machine, the machine you are connecting to.