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The Notify Flag
The "notify" (MCI_NOTIFY) flag directs the device to post an MM_MCINOTIFY message when the device completes an action. Your application must have a
window procedure to process the MM_MCINOTIFY message for notification to have any
effect. An MM_MCINOTIFY message indicates that the processing of a command has
completed, but it does not indicate whether the command was completed
successfully, failed, or was superseded or aborted.
The application specifies the handle to the destination window for the message
when it issues a command. In the command-string interface, this handle is the
last parameter of the mciSendString function. In the command-message interface, the handle is specified in the
low-order word of the dwCallBack member of the structure sent with the command message. (Every structure
associated with a command message contains this member.)
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