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The communications driver exports the CommWriteString and
EnableNotification functions. The CommWriteString function writes a string
of one or more bytes to the given communications device.
 
The EnableNotification function enables or disables port status
notifications. If notifications are enabled, the communications driver posts
a WM_COMMNOTIFY message to a given window on certain events. This eliminates
the need for communications applications to set timers and use the
GetCommError, GetCommEventMask, and SetCommEventMask functions to monitor
port status changes.
 
 
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