INT 2F - MS Windows 3.1 - IDENTIFY TSRs
        AX = 160Bh
        ???
Return: ???

Format of TSR-to-Windows communication structure:
Offset  Size    Description
 00h    DWORD   pointer to next structure
 04h    WORD    PSP segment
 06h    WORD    API version ID (0100h)
 08h    WORD    EXEC flags
                bit 0: "WINEXEC"
                bit 1: "LOADLIBRARY"
                bit 2: "OPENDRIVER"
 0Ah    WORD    "exec_cmd_show"
 0Ch    DWORD   "exec_cmd"
 10h  4 BYTEs   reserved (0)
 14h    DWORD   TSR ID block
 18h    DWORD   TSR data block