INT 2F - Stacker 4 LZS Compression Interface (LZSAPI)
AX = 4A12h
CX = 5354h ("ST")
DX = 4143h ("AC")
Return: AX = 4F4Bh ("OK") if installed
CX = 7374h ("st") if installed
DX = 6163h ("ac") if installed
ES:DI -> entry point in LZSAPI server (usually, driver
STACKER.COM) containing far address of an actual
LZSINFO structure (see #02808)
SeeAlso: AX=4A12h/CX=4D52h,INT 25/AX=CDCDh