About System Messages

The Windows operating system provides two predefined classes of system messages: device messages and power messages. Device messages notify applications and installable drivers of device change events; power messages notify these of power management events. Applications and other components can also define and use their own system messages to provide for notification of other types of events.

This overview describes system messages, system-message broadcasts, and the specific class of system messages called device messages. For more information about power messages, see Power Management.

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