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