A method and program for preventing an interrupting action in a computer resource for a full-screen mode or presentation mode of a user application are disclosed. Such a method includes: detecting, for example by a window manager, that a user application is entering into full-screen mode in a display space of the computer resource; transmitting to a target module, for example via a message bus, a mode message indicating that the full-screen mode is being entered; and preventing the interrupting action by the target module. The interrupting action may be a display action in a display space associated with the computer resource. The target module may be an instant messaging application, a screen saver application, a calendar application, a power management application, or a voice communication application.