IPC Mailslots

Mailslots provide a one-way interprocess communications capability. Any process can create a mailslot and become a mailslot server. Other processes, called mailslot clients, can gain access to the mailslot by its name and send messages to the mailslot server process. A process can be both a mailslot server and a mailslot client, so two-way IPC is possible with multiple mailslots.

Incoming messages are always appended to the mailslot. The mailslot saves the messages until the creating process has a chance to read them.

Mailslots are similar to named pipes, but with a somewhat simplified programming interface and the added ability to broadcast messages to all computers in a specified network domain. A mailslot client can send a message to a mailslot on its local computer, to a mailslot on another computer, or to all mailslots with the same name on all computers in a specified network domain. Messages broadcast to a domain can be no longer than 400 bytes; messages sent to a single mailslot are limited only by the maximum message size specified by the creator of the mailslot (which can be unlimited).

Key Point Mailslots offer an easy way for applications to send and receive short messages. They also provide the ability to broadcast messages across all computers in a network domain. For more information, see Mailslots.

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