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# Registering Descriptors

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You use a session to perform persistence operations on the objects described by TopLink mapping metadata represented as a TopLink project (see "Understanding Projects"). Each session must therefor be associated with the descriptors of at least one TopLink project. You associate descriptors with a session by registering them with the session.

The preferred way to register descriptors with a session is to use TopLink Workbench to configure the session with a mapping project (see "Configuring a Primary Mapping Project" and "Configuring Multiple Mapping Projects").