Default Action

To support new users and keyboard-only users, provide default actions as shortcuts only for application features that are available by some other method.

When a window has focus, show default emphasis on the push button in the window, if any, that performs the current default action for that window.

Except when focus is on a tool or object or in a menu, if the default action of a window varies, provide a push button that corresponds to each default action.

When the focus is on a push button, make its action the default action.

When the focus is on a choice in a menu other than a tear-off menu, make the default action activate or toggle that choice.

When focus is on an object icon, the default action should present data of the corresponding object; for a window icon display the corresponding window.

When the user presses keypadEnter, Ctrl Enter, or Enter (except in text), invoke the default action. Except possibly when on an element that is both activatable and selectable, it should have no other effect.

When the user double-clicks the SELECT button and focus is on a value choice that is part of a mutually exclusive group of value choices (for example, on a radio button, a tool, or in a value set), invoke the default action.