Communications software manages the flow of data across a network. It performs the following functions:
• Access control: Linking and disconnecting the different devices; automatically dialing and answering telephones; restricting access to authorized users; and establishing parameters such as speed, mode, and direction of transmission.
• Network management: Polling devices to see whether they are ready to send or receive data; queuing input and output; determining system priorities; routing messages; and logging network activity, use, and errors.
• Data and file transmission: Controlling the transfer of data, files, and messages among the various devices.
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