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INT 2F - Multiplex - DOS 3+ PRINT.COM - SUBMIT FILE
        AX = 0101h
        DS:DX -> packet (see below)
Return: CF set on error
            AX = error code
        CF clear if successful
            AL = 01h added to queue
                 9Eh now printing
SeeAlso: AX=0102h

Format of submit packet:
Offset  Size    Description
 00h    BYTE    level (must be 0)
 01h    DWORD   pointer to ASCIZ filename (no wildcards)