LPT1 through LPT4
The printer attached to the first through fourth printer (parallel) ports. The
device need not physically attach to the parallel port; Windows can redirect the output to the physical
device for you. You must configure network printers to provide a port to provide a command
line device. The port appears on the Ports tab of the network printer??™s Properties dialog box. Even if
your printer can provide bidirectional communication, the LPT devices are only capable of output.
AUX
The auxiliary device; the one serviced by the first serial port (COM1). It??™s usually better to
reference COM1 directly for readability in batch files. The AUX device is a holdover from the early
days of DOS.
COM1 through COM4
The communication device attached to the first through fourth serial ports.
Although standard outputs for this port include modems, you can connect printers as well. The serial
port can act as both an input and an output device. You can configure network printers to use a COM
port instead of an LPT port using the Ports tab of the network printer??™s Properties dialog box.
NUL
The output doesn??™t go anywhere. The NUL(L) device is also known as the bit bucket.
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