The Process send from some devices to Computer CPU but all process does not sent with the same priority. Device driver generate a special type of signal is called an interrupt. Windows interrupt causes to temporarily halt what is doing to divert all attention to the service that issues the interrupt signal. The current process location information in system, called a stack. Now, Windows opens a path from the device that issued the interrupt to the CPU, and then runs the important process.
When the new process is completed, Windows generates an interrupt return signal. The interrupt return signal instructs the CPU to retrieve the address of the past operations from the stack and then to resuming run that process from where it left off. In several instances, Windows is capable of masking the interrupt so as not to interface with previous running process; Windows intercepts the interrupt signal and holds it so that the current process can be completely as fast as possible. The process is done running Windows then puts through the interrupt request.

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