Joined: 07 Nov 2005 Posts: 1105 Location: The Netherlands at Hole 19
Check the manual at this site and search for 'comp'. You'll find this:
COMPUTATIONAL or COMP
Representation of the COMPUTATIONAL phrase is system-dependent and is
normally assigned to representations that yield the greatest
efficiency when arithmetic operations are performed on that system.
Then read whatever you're interested in. The manual can tell you all you need to know. If you've got any specific questions get back to me.