12.6. Displaying Dialogs from within a Service
Frequently it is useful to display simple message boxes from within a service. For example, the Messenger service listens on the network for messages sent with the net send command and displays a message box for any messages that arrive. It is easy to modify the beep service shown in Section 12.4 to emulate this behavior. Any more advanced user interface to a service requires that you write a separate GUI front end and hook it to the service with something like a named pipe. Note the use of MB_DEFAULT_DESKTOP_ONLY.
As an example, you might want to create a "logon announcement" service that announces people when they log onto an NT machine on your network. In order to do this, the service will want ...
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