Client server is about having more than one consumer that needs to share and mutate the same data. In other words, collaboration. In general the pattern doesn't

Client server is about having more than one consumer that needs to share and mutate the same data. In other words, collaboration. In general the pattern doesn't care where the hardware is located. Remote hardware just accentuates issues that are only obvious due to high latency. A local system for example could get away with a less sophisticated locking mechanism... until it doesn't.