A multiple computer environment is disclosed in which an application program executes simultaneously on a plurality of computers (M1, M2, . . . , Mn) interconnected by a communications network (53) and in which the local memory of each computer is not maintained substantially the same by updating in due course. An address table mechanism to permit access to an asset, object, or structure (such as a memory location) for the purpose of updating, for example. Not all computers have the same memory, and it is not necessary for all computers to be updated.