If you are using X windows purely on a workstation, then there is no problem. Graphical output created by X will appear automatically on your screen. The problem arises if you are logged on to an X client other than the machine that you are sat in front of (the X server).
Suppose that you are sat in front of a SPARCstation called rlssp0 , but that you are remotely logged
into rlsaxps, a Compaq Alpha. To get X output from a program run on rlsaxps to be displayed on
the screen of rlssp0, you need to type
This is easy to forget and too much to type every time you do a remote login.