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Since replicas are kept in sync in an asynchronous way, ClearCase must keep track of access so that multiple teams do not perform conflicting operations. The paradigm of mastership allows this. Specific data or metadata within a VOB have a property which specifies what particular replica is allowed to modify them. Thus, a VOB object or piece of metadata can only be manipulated by one replica at a time. MultiSite also has the ability to change this property so that different teams can change the mastership of VOB data. This can be done by changing the mastership manually from a "giving" site or by a request for mastership from a "receiving" site.
== UCM ==
In the recent years, a [[UCM]] extension has been developed, supporting a more traditional model.
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