Choosing and configuring a port
Print monitor is a term used to describe two types of print monitors: language monitor and port monitor. A language monitor is needed to support bidirectional printing, which is a two-way communication between the printer and the spooler running on the print server The spooler can then access configuration and status information from the printer. The port monitor controls the I/O port to the printer. A printer port is the interface through which a printer communicates with the computer. You can add printer ports while adding a printer (using the Add Printer Wizard), from the Ports tab in the printer's property page, or through the print server property page.
If the printer is physically attached to the print server, select the appropriate local port. LPT1 through LPT3 represent parallel ports; COM1 through COM4 represent serial ports When a client prints to a printer port denoted as FILE, the client is prompted for the file name. If you decide to add a new local port you can enter one of the following:
Certain ports are not listed in the Ports tab unless a printer that requires one of them is installed. Universal serial bus (USB) and IEEE 1394 printers support Plug and Play so when you plug a printer into the correct physical port (USB or IEEE 1394), the correct port monitor is installed automatically. Windows will detect the device and display its settings on the screen, prompting you to approve. You might be required to insert a CD-ROM containing driver files, as described in To add a local port
If the printer is attached directly to the network, add a port when prompted by the Add Printer Wizard for a port selection. The following table shows the port options available and explains under what conditions the port is available. To add a port, you must have Administrator or Power Users privileges, and have the Load/Unload Device Drivers privilege.