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An object continues to exist until the last non-expired link referencing the object is removed. If a user wishes to recover the storage space for an object, it is flagged for removal. When links to the object are refreshed, notification is sent that the object is about to disappear, and anyone wanting to maintain their reference must copy the object elsewhere. Subsequent users have the option of making their own copy, or updating their link to refer to one of the new copies.

Padma Indraganti
Thu Jun 20 13:02:20 PDT 1996