Let's suppose I've been working on a txt file, and I go to close TextEdit. It prompts me to 'Save' (highlighted by default), Dont' Save, or Cancel. How do I move between those options (ie highlight the next button) without touching the mouse?! I'm a switcher, and would be accustomed to simply using tab to move between the options - but on my mac I can't find any keystroke which does it - and have to click the one I want (if its not the default highlighted one) and its driving me nuts! Thanks for being here.