Int 13 Fn 8006 - Fast! V4.02+ - Installation Check [c] AX = 8006h CX = 6572h DX = 1970h ES:BX -> request packet (see below) Return: AX = 1965h if installed See Also: AH=80h,AX=8001h,AX=8007h Format of request packet: Offset Size Description 00h DWORD -> 19-byte signature string (see AH=80h)