Menu shortcuts
When a menu is open, you can select an item from it without using
the mouse by typing the underlined letter (mnemonic) in the item's
name. For example, you could type O to select
Open from the following menu:

Figure 4-1 Menu Shortcuts
Some frequently used menu items can be selected from the keyboard without opening the menu. Such items are identified by a combination of keys (accelerators) to the right of the menu item. For example, you could enter: <Ctrl>N to select New from the menu above.