Programming mechanisms to Support RPC IMplementations of ONC RPC provide significant help for those who wish to avoid unnecessary programming ASsistance comes in four forms D XDR library routines that convert individual data items from internal form to the Xdr standard external representation5 Programming Mechanisms to Support RPC Implementations of ONC RPC provide significant help for those who wish to avoid unnecessary programming Assistance comes in four forms: XDR library routines that convert individual data items from internal form to the XDR standard external representation