INT 2F U - IOMEGA DRIVERS - SECONDARY INSTALLATION CHECK AX = 5701h BX = program ID??? (0201h used by GUEST.EXE) DX = 496Fh ('Io') Return: AX = 0001h if GUEST.EXE installed SeeAlso: AX=5700h,AX=5710h,AX=5711h,AX=5712h