Propose display.quit = 1 to mean "quit the program if this window is closed." That would make it possible to quit a multiwindow program easily. The default is display.quit = 0.
A related issue is that if the user quits a normal window it should not come back. Currently the window is recreated if mouse info is requested for that window.
Addressed in Visual 2000-06-01. The attribute is named 'exit' and the default is exit=1, since that is equivalent to the old behavior in the single-window case. In 06-01 a window will never come back automatically once it has been explicitly closed by the user or the program.