Messaging-related services,JTA Transaction Recovery Service, and user-defined singleton services which are hosted on individual server instances within a cluster are called as pinned services.They are not supported by failover for failure recovery but by weblogic server migration framework hence they are also called as migratable services.
you can get more details on the same from following location
http://download.oracle.com/docs/cd/E11035_01/wls100/cluster/service_migration.html
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