The X Window system is Linux's Graphical User Interface (GUI).
These days most of the commercial Linux distributions will do a good bit of the work of configuring the X system for you. However, in order for things to run smoothly, you will need the following information:
Horizontal Synchronization Rate of your monitor
Vertical Refresh Rate of your monitor
Chipset and Memory size of your video card
The SuperProbe program may or may not be able to automatically detect some of this information for you. There was a time when you could count on that information being included in the documentation that came with your machine. These days you're probably going to have to go to your manufacturer's Web site. Encouragingly, however, I have noted ...