INT 16 U - PCIBM PC Tools v7 only CPSCHED/DESKTOP - ALTERNATE INSTALLATION CHECK AX = FEF1h BX = ??? Return: CX = 5555h if PCIBM PC Tools scheduler (CPSCHED or DESKTOP) installed DX = 5555h Note: this function is identical to AX=FFD3h, and is implemented by the same code in DESKTOP SeeAlso: AX=FFF1h