> You don’t share memory with other human beings. This really depends on where you draw the boundaries. In a computer everything is "memory" of one kind or ano

> You don’t share memory with other human beings. This really depends on where you draw the boundaries. In a computer everything is "memory" of one kind or another, but that doesn't necessarily correspond to human memory. The analogy works if you think of the "actor" as merely the thread's context and dedicated working space (stack), with everything else being part of the surrounding environment. In the real world we don't have anything akin to process separation, except by convention. Even the body itself can be directly manipulated by others. The convention we use for communication between individuals looks more like a message-passing system, but physical manipulation of matter is more like operating on data in shared memory. There is no physical law preventing someone else from coming along and messing with an object I happen to be holding any more than the rules of a computer prevent one thread from messing with a data object held by another thread.