Procedure Call Interface: A procedure from one module calls to procedure of another module. The caller can pass data to the called procedure while calling and also the called procedure can pass data to the caller while returning control back to the caller procedure.
Shared Memory: When a block of memory is shared between two modules. The memory block may be allocated by one of the two modules or third module of the same application.
Message Passing Interface: One module generates a message and sends the message to another module. It helps in building up the communication between different process or modules.
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