This chapter provides a (necessarily) brief introduction to computer networking concepts. For many applications of gawk to TCP/IP networking, we hope that this is enough. For more advanced tasks, you will need deeper background, and it may be necessary to switch to lower-level programming in C or C++.

There are two real-life models for the way computers send messages to each other over a network. While the analogies are not perfect, they are close enough to convey the major concepts. These two models are the phone system (reliable byte-stream communications), and the postal system (best-effort datagrams).
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The UCM-8x modems are a series of general-purpose industrial modems, which can be used for data communication through Public Switched Telephone Networks (PSTN) or Leased/Private Lines. The modems can operate in 2-wire, full-duplex, asynchronous modes at line rates up to 33.6 Kbps and can perform complete handshake and data rate negotiations. Tone and pattern detection functions required by the applicable ITU or Bell standards are supported and dialling, call progress, and the telephone line interface are supported and controlled through the AT command set.
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If Manual Duplex does not appear as a printer option, perform the following steps:. a. Verify that HP Manual Duplex&Booklet (Classic) was selected when the
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