-Call this to explicitly exit the main message (event) loop.
-You should normally exit the main loop (and the application) by deleting
-the top window.
+Returns \true if the application is active, i.e. if one of its windows is
+currently in the foreground. If this function returns \false and you need to
+attract users attention to the application, you may use
+\helpref{wxTopLevelWindow::RequestUserAttention}{wxtoplevelwindowrequestuserattention}
+to do it.