The basic function of a menu is to offer a selection of available options. The options are displayed within a window as a list of menu items. Activating an item of a menu causes the associated action to be performed. When a new window is opened or another window is brought to top, a menu usually disappears. One exception to this is the "Topbar Menu", which stays opened but pushes itself behind other windows. Other so-called pop-up menues are only invoked in certain contexts and therefore provide context dependent functions.

A description of all menues is given in the following sections:

Context dependent pop-up menues are described in further sections: