INT 21 - Novell NetWare - PRINT SERVICES - FLUSH SPECIFIC LPT CAPTURE
        AH = DFh
        DL = 07h
        DH = LPT port (00h-02h)
Return: AL = status
            00h successful
Desc:   this function closes the current capture file for the specified LPT
          and starts printing it if it is not a permanent capture file
Notes:  this function is supported by Advanced NetWare 2.1+
        if more data is sent to the LPT port after this call, a new capture
          file will be opeend
SeeAlso: AH=DFh/DL=04h,AH=DFh/DL=05h,AH=DFh/DL=06h