UUCP

• uucp, which requests the copying of a specific file to another specified system
• uux, which sends a UNIX command to another system where it is queued for execution
• uucico, which runs on a UNIX system as the program that carries out the copying and initiates execution of the commands that have been sent. Typically, this program is run at various times of day; meanwhile, the copy (uucp) and command (uux) requests are queued until the uucico program is run.
• uuxqt, which executes the commands sent by uux, usually after being started by the uucico program

The uucico programs are the programs that actually communicate across a network. There are several network protocols (variations on packet size and error-checking) that can be used by uucico programs, depending on the kinds of carrier networks being used.

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