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Multi-processor Operating System or Multi-processing or Parallel system: 

 

Multi-processor operating system is a tightly coupled system where multiple CPUs are connected into a single system and each shares main memory and peripherals. Multiprocessing operating systems are used to the execution of several processes simultaneously in a system, where each process occupied one CPU, unlike a single processing system. 

 

Multi-programming and multi-tasking are a little bit different in comparison to multi-processing system because multi-tusking or multi-programming is used with a single processor but switch it in as per allocated time slices between tasks or jobs (i.e. a time-sharing system).

 

So, it is capable of run multiple processes but only sharing a single CPU, whereas multiprocessing however means true parallel execution of several processes using more than one processor.Windows NT, 2000, XP, Mac and UNIX are all multi-processing systems.

 

Multi-processing system