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 {TAIL ~ a switched communications gateway} in the distributed system, and permitting the issuance of multiple threads of control, according to {HEAD ~ the type} of function the procedure call represents 
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 { TAIL ~ a switched communications gateway } in the distributed system , and permitting the issuance of multiple threads of control , according to { HEAD ~ the type } of function the procedure call represents
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