The Tab Key
The TAB key is another accelerator key that enables faster keyboard navigation. It also serves one vital function; if the mouse hardware device fails, the tab key provides a secondary means of menu navigation until the mouse can be repaired or replaced.
Each time the tab key is pressed, the focus (a dotted rectangle or blue highlight signifies this) moves onto a new item. This item can be a button, icon or menu option. To emulate double clicking on the selected item, press the return key. Figure 17 shows a standard message (dialog) box.
Note that the Yes button has a dotted rectangle around it. This indicates that it currently holds the input focus pressing the return key now would cause the same result as clicking the Yes button, namely the folder would be deleted. Pressing tab once will move the input focus to the next item, in this case, the No button.
Table 2 shows some Tab key accelerator combinations:
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