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A three-tier architecture introduces a server (or
an "agent") between the client and the server. The role of
the agent is manyfold. It can provide translation services
(as in adapting a legacy application on a mainframe to a
client/server environment), metering services (as in
acting as a transaction monitor to limit the number of
simultaneous requests to a given server), or intellegent
agent services (as in mapping a request to a number of
different servers, collating the results, and returning a
single response to the client.
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