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

Format of SLSRELEASE structure:
Offset  Size    Description
 00h    DWORD   handle indentifying license context
 04h    DWORD   total units consumed
 08h    DWORD   address of comment string