Int 2F Fn C000  - Aspihook.sys - Installation Check                        [i]

   AX = C000h

Return: AL = FFh if multiplex number in use
       ES:DI -> ASCIZ signature "ASPIHOOK" if ASPIHOOK.SYS installed
Program: ASPIHOOK is a device driver for monitoring SCSI activity through an
     ASPI host manager; it is part of the Personal Measure system
     activity monitor from Spirit of Performance, Inc.

Note:  AH=C0h is the default; ASPIHOOK searches for a free multiplex number
     between C0h and FFh on which to install itself

See Also: AX=C000h"PMEASURE"