As helper for develop application forms fit to some resolution I created this little application.
It has tray icon/menu and draw frame (with hole) that can be dragged on the screen
and can be changed resolution of this frame.
It's in Czech language, but it's simple to see it clear.
Only little help (Czech to English):
Obdelnik = Rectangle
Zmena Rozliseni = Change of Resolution
Nastaveni = Options
Barva Okraje = Color of Frame
Sirka Okraje = Width of Frame
Zobrazit Obdelnik = Show re