Users can use all windows and user input events without restriction.
Users cannot use any windows or user interface events. No user interface can be used.
Users can only use SafeSubWindows for drawing, and can only use user input events for user interface within that subwindow. Examples of SafeSubWindows are a MessageBox, common dialog controls, and a control displayed within a browser.
Users can only use SafeTopLevelWindows and SafeSubWindows for drawing, and can only use user input events for the user interface within those top-level windows and subwindows.
When it runs under SafeTopLevelWindows permission, your application:
Will show the DNS name or IP address of the Web site from which the application was loaded in its title bar.
Will display Balloon tool-tip when it first displays, informing the user that it is running under a restricted trust level.
Must display its title bar at all times.
Must display window controls on its forms.
Cannot minimize its main window on startup.
Cannot move its windows off-screen.
Cannot use the Opacity property on Form to make its windows less than 50% transparent.
Must use only rectangular windows, and must include the window frame. Windows Forms will not honor setting FormBorderStyle to None.
Cannot make windows invisible. Any attempt by the application to set the Visible property on its Form objects to False will be ignored.
Must have an entry in the Task Bar.
Will have its controls prohibited from accessing the Parent property. By implication, controls will also be barred from accessing siblings - i.e., other controls at the same level of nesting.