Local transparency means that the location of distributed components in a computer network are hidden for the user of the net. All available components are resources or elements of the network-connected computers. The access to such distributed elements is realized in network operating systems and distributed operating systems via the client/server organization model. This model subdivides the network programs into instances which initiate the executions (client program part of the network program) and into service offering resp. executing partner instances (server program part of the network program). The access to distant elements (elements of another computer) is not realized directly and requires an ordering relation between local client process and distant server process.