#202203021657 concentrates its efforts on utilising its communication facilities, which is message-passing. This resulted in a blending of memory and 202204222158# where Mach could be used for distributed and parallel programming.
To improve the efficiency, Mach caches the remote memory objects into local memory. For local memory objects, it passes the messages by merely moving the pointer to point to the shared memory objects. For all messages, if they are local to the machine, especially if they are large too, they are 202203251058. Otherwise, they will be handled by 202204231514#.