Which Files Call Which?

[Stewart]

A while ago I installed a screen print program, hacked and originally
provided by a helpful friend who told me that it was just put in
place of the "sprint" file in the system and then the print key would
access it.  Of course!  Now I was just wondering if anyone has a list
of interesting calls  in the system.  What keys use which files/functions
and which common software packages call what existing functions/files?
Possibly this information exists in a manual, but I haven't read them
all yet.  One example that comes to mind is PaintPower.  What functions
or files does it use instead of sprint to print its greater-than-screen-size
picture?  I know where the filters are, but...?  All interesting
tidbits welcome!

				- Mark

				G. Mark Stewart
				ATT_BTL, Naperville, Ill. ix1g266
				ixlpq!gms (312)979-0914
				(please include phone in response)