Proponents of efficient computing know that the keyboard is really all you need to get around your system. Between keyboard shortcuts and macros, you can accomplish most tasks without needing to ever touch the mouse (which is only really necessary for precision in image-editing). On both the Mac OS and Windows, you can use the keyboard to sift through menus (Alt on Windows, Ctrl+F2 on Mac) and navigate forms and links (Tab and Shift+Tab on both). However, Mac OS seems to be a little more limited when it comes to "Tabbing" through dialog boxes. For example you can't by default use Tab to highlight drop-down menus (eg. when saving documents and choosing an extension type).