1. (Of an interface) Having modes. Modeless interfaces are generally considered
to be superior because the user does not have to remember which mode he is in.
2. See modal logic.
3. In MS Windows programming, A window with the label "WS_MODAL" will stay on
the screen and claim all the user-input. Other windows can only be accessed if
the MODAL window is closed. Such a window would typically be used for an error
dialog box to warn the user for something important, like "Critical error, shut
down the system and restart".
Mock Lisp « mod « *MOD « modal » modal logic
» MODCAL » Mode