OS Interprocess Communication
The shared storage may be in main memory or it may also be a shared file, the location of the shared memory doesn't change the nature of the communication or the problems that arise.
To realise how the IPC (Interprocess Communication) works, think of a simple example of a print spooler. When a process wants to print a file, it enters the file name in a special spooler directory. The printer daemon, an another process, periodically checks to see if there are any files to be printed, if yes, then it prints them and removes their names form the directory.
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