Several commands can be also be invoked using keystrokes. In many dialog boxes, the default button can be activated by pressing the Enter-key. Similarly, pressing the Escape-key will usually close a dialog box.
Some user interface elements (menus, menu items, buttons) have a shortcut, that is, a certain letter in their label is underlined. Pressing this letter in combination with the ALT key activates the associated user interface widget.
Additionally some elements have a context menu which can be invoked through the right mouse button.
Note: the exact way meta keys like ALT and CTRL work may differ from platform to platform. For example, Apple computers usually dont have a second mouse button; here the context menu is opened by pressing the CTRL key and the mouse button simultaneously.