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