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A temporary servlet is started when a request arrives and shut down after the response is generated. A permanent servlet is loaded when the server is started and lives until the server is shut down.

* This is useful when startup costs are high, such as a servlet that establishes a connection to a database.

* Also useful for permanent serverside service, such as an RMI server.

* Provides faster response to client requests when this is crucial. Being temporary or permanent is part of the server configuration.

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