http://www.rfc-editor.org/rfc/rfc1050.txt
RFC 1050: RPC: Remote Procedure Call Protocol specification, 1988-04-01T23:00:00-00:00This memo specifies a message protocol used in implementing Sun's Remote Procedure Call (RPC) package. This RFC describes a standard that Sun Microsystems and others are using and is one they wish to propose for the Internet's consideration. It is not an Internet standard at this time.