NAME
	NextDisplayInfo -- iterate current displayinfo identifiers (V36)

   SYNOPSIS
	next_ID = NextDisplayInfo(last_ID)
	D0                        D0

	ULONG NextDisplayInfo(ULONG);

   FUNCTION
	The basic iteration function with which to find all records in the
	graphics database.  Using each ID in succession, you can then call
	FindDisplayInfo() to obtain the handle associated with each ID.
	Each ID is a 32-bit Key which uniquely identifies one record.
	The INVALID_ID is special, and indicates the end-of-list.

   INPUTS
	last_ID - previous displayinfo identifier
	          or INVALID_ID if beginning iteration.

   RESULT
	next_ID - subsequent displayinfo identifier
	          or INVALID_ID if no more records.

   BUGS

   SEE ALSO
	FindDisplayInfo(), GetDisplayInfoData()
	graphics/displayinfo.h