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        Communicating Applications Spec - Submit file to send

        Entry:
          AX = CB15h
          DS:DX -> variable-length data area
        Return:
          AX >= 0 event handle
             <  0 error code (see AX=CB01h)

        Format of data area:

        Offset  Size    Description
         00h    BYTE    transfer type
                        00h = 200x200 dpi, fax mode
                        01h = 100x200 dpi, fax mode
                        02h = file transfer mode
                        03h to 7Fh reserved
         01h    BYTE    text size
                        00h = 80 columns
                        01h = 132 columns
                        02h to 7Fh reserved
         02h    WORD    time to send (DOS packed time format,
                        see INT 21/AX=5700h)
         04h    WORD    date to send (DOS packed date format,
                        see INT 21/AX=5700h)
         06h 32 BYTEs   ASCIZ destination name
         26h 80 BYTEs   ASCIZ name of file to send
         76h 47 BYTEs   ASCIZ phone number to dial
         A5h 64 BYTEs   ASCIZ application-specific tag string
         E5h    BYTE    reserved (00h)
         E6h    BYTE    cover page
                        00h don't send cover page
                        01h send cover page
                        02h to 7Fh reserved
         E7h 23 BYTEs   reserved (zeros)
         FEh variable   ASCIZ string containing text of cover page
                        (if cover page flag set to 01h)