The interface extends the remote procedure calling facility beyond {TAIL ~ the distributed system} by classifying the different types of remote procedure calls that can be issued to a switched communications gateway in the distributed system, and permitting {HEAD ~ the issuance} of multiple threads of control, according to the type of function the procedure call represents 
The interface extends the remote procedure calling facility beyond { TAIL ~ the distributed system } by classifying the different types of remote procedure calls that can be issued to a switched communications gateway in the distributed system , and permitting { HEAD ~ the issuance } of multiple threads of control , according to the type of function the procedure call represents
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