INT 13 - FAST! v4.02+ - UNHOOK INTERRUPTS
        AX = 8007h
        CX = 6572h
        DX = 1970h
        ES:BX -> request packet (see below)
Return: AX = 1965h if installed
SeeAlso: AH=80h,AX=8006h
Index:  uninstall;FAST!

Format of request packet:
Offset  Size    Description
 00h    DWORD   -> 19-byte signature string (see AH=80h)

.