Work in dialog boxes by using shortcut keys

Press	To
CTRL+TAB	Switch to the next tab in a dialog box
CTRL+SHIFT+TAB	Switch to the previous tab in a dialog box
TAB	Move to the next option or option group
SHIFT+TAB	Move to the previous option or option group
Arrow keys	Move between options in the active list or between some options in a group of options
SPACEBAR	Select or clear the active check box
Letter key	Move to an option in the selected list, where the letter key is the first letter in the option name
ALT+ letter	Select an option, or select or clear a check box, where letter is the key for the underlined letter in the option name
ALT+DOWN ARROW	Open the selected list
ESC	Close the selected list
ENTER	Perform the action assigned to the default command button in the dialog box (the button with the bold outline — often the OK button)
ESC	Cancel the command and close the dialog box