In computer networking, master/slave is a model for
a communication protocol in which one device or process (known as the
master) controls one or more other devices or processes (known as slaves).
Once the master/slave relationship is established, the direction of control
is always from the master to the slave(s).
Other communication protocol models include the client/server model, in
which a server program responds to requests from a client program, and
the peer-to-peer model, in which either of the two devices involved can
initiate a communication session.
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