In a multitasking, multiuser computer system, a server process temporarily impersonates the characteristics of a client process when the client process preforms a remote procedure call on the server process. Each process has an identifier list with a plurality of identifiers that characterize the process....http://www.google.co.uk/patents/US5321841?utm_source=gb-gplus-sharePatent US5321841 - System for determining the rights of object access for a server process by combining them with the rights of the client process
