Explain Inter-process Communication (IPC) using mailbox/queue.
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Inter-process communication using mailbox:

Mailbox is the Interprocess communication mechanism. A process puts a data message for another process in the mailbox. Mailbox is also called as message exchange. More than one task can receive data from the mailbox. Mailbox message is the message pointer. Or Mailbox message can also be a message. In mailbox IPC the sender need not to know the name of the receiver.

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