For my program, I need to pop up a dialog at first run so that the user can enter the directory where the data files are (they don't come with the program). I can look at my configuration file to decide whether or not to show the dialog - the question is where in my code to show it. If I put it in main() before app.exec(), the even loop won't have started yet, so it won't be responsive. I suspect there's an even handler in my main window class that I need to implement, but I can't figure out which one from the documentation.

The code path I think I need:
*Create main window
* run app.exec
* some even handler gets called
* show dialog