Int 16/AX=FA08h/DX=5945h

AX = FA08h
DX = 5945h

Return:
CF clear
DI = 4559h
AX = ??? (0002h)
BX = version (BH=major, BL=two-digit minor)

Note: This function is not supported by the PC Tools 9.0 VSAFE v2.0

See Also: AX=FA00h - AX=FA06h