INT 21 - Volkov Commander - INSTALLATION CHECK AH = 2Bh CX = 5643h ('VC') DX = 4F4Dh ('OM') AL = function number 00h get left window data address 01h get right window data address 02h get address of general variables Return: AL = 00h if Volkov Commander installed AH = version code (27h for v4.00.039) ES:BX -> requested data Program: Volkov Commander is a Norton Commander-like DOS shell