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MailSlot

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Mailslot is a one-way interprocess communication mechanism, available on the Microsoft Windows operating system that allows communication between processes locally. Up until Window 11 24H2, mailslots also supported communication over a network . The use of Mailslots is generally simpler than named pipes or sockets when a relatively small number of relatively short messages is expected to be transmitted, such as for example infrequent state-change messages, or as part of a peer-discovery protocol. Up until Windows 11 24H2, the Mailslot mechanism also allowed for short message broadcasts ("datagrams") to all listening computers across a given network domain.