{HEAD ~ The interface} extends the remote procedure calling facility beyond 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 the issuance of multiple threads of control, according to the type of {TAIL ~ function} the procedure call represents 
{ HEAD ~ The interface } extends the remote procedure calling facility beyond 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 the issuance of multiple threads of control , according to the type of { TAIL ~ function } the procedure call represents
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