INT 2F - License Service API - QUERY License
        AX = 7005h
        CX = license server index (0000h to 001Fh)
        DS:DX -> SLSQUERY structure (see below)
        ES:BX = provider specific handle for the license context
Return: AL = status
            00h not installed
            FFh installed
SeeAlso: AX=7002h

Format of SLSQUERY structure:
Offset  Size    Description
 00h    DWORD   (return) status code
 04h    DWORD   handle identifying license context
 08h    DWORD   information index
 0Ch    DWORD   buffer size in bytes
 10h  N BYTEs   data buffer