INT 2F - NORTON UTILITIES 5.0+ DISKMON, FILESAVE / EP - internal - ???
AX = FE04h
DI = 4E55h ("NU")
SI = TSR identifier (see #03140)
Return: SI = TSR reply (lowercase version of entry SI, i.e. SI or 2020h)
AX = status
0008h successful???
SeeAlso: AX=FE00h