INT 2F - MS Windows 3.1 - IDENTIFY TSRs
        AX = 160Bh
        ES:DI -> communication structure (see below) or 0000h:0000h
Return: ES:DI -> communication structure
Desc:   this call allows Windows-aware TSRs to make themselves known to
          Windows.
Note:   the TSR should allocate a communication structure, place the given
          ES:DI pointer in the first field, and return a pointer to the new
          structure
SeeAlso: AX=1605h,AX=160Ch,AX=4B01h,AX=4B05h

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   pointer to TSR ID block (see below)
 18h    DWORD   pointer to TSR data block or 0000h:0000h

Format of Norton Utilities 6.0 TSR ID block:
Offset  Size    Description
 00h    WORD    length of name string
 02h  N BYTEs   name of TSR's executable

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