http://www.cs.rpi.edu/wwc/salsa
Join Continuation
•Provides a mechanism for synchronizing the processing of a set of messages.
•Set of results is sent along as a token.
–Example:
•Actor[] actors = { searcher0, searcher1,    searcher2, searcher3 };
•join( actors<-find( phrase ) ) @
• resultActor<-output( token );
•Send the find( phrase ) message to each actor in actors[] then after all have completed send the result to resultActor with an output( … ) message.
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