>I'm a newbie on Windows NT.
>I like to know how to use server port. For example, I like to use my modem server to send a fax.

You need to load appropriate server software to share the port to other stations on the network; in the case of making a modem available to send faxes, the best (or at least easiest) approach would be to load up fax software (WinFax for example) and then make the outbound fax printer shared to other stations on the network. You'd need to load an appropriate fax printer driver on eachstation, which then spools jobs to the fax modem virtual printer.

More sophisticated manipulation can be done by loading fax server software such as NT's Fax Server (a part of NT SBS if you have it; it can be added separately) or a network fax product like WinFax Pro Net, and then installing appropriate fax clients on the stations that need access to the outbound fax server. The client stations then talk to the server, which performs the active management of the fax queues. In many cases, you can access the fax services through OLE Automation or DDE, giving better programmatic control of outbound fax processing.

Another approach would be to use a product like WinPort to share the comm port as an INT14 device on the network; it then becomes the responsibility of each station to run all the fax handling themselves, routing the I/O across the network to the comm port on the NT system.