Ball-less means 'without a ball.' Like an optical mouse, except that it's some form of RF for the Intuos tablets.
Nifty trick that I use is to actually print a copy of the document that I want to retouch, and slip it under the plastic cover of the tablet (you can do that), then, zoom your document so it's the same size on screen. You can then use the stylus just like a pen. Much more accurate than a mouse.
For word processing, web-browsing, etc., you want to switch tools to the mouse tool, and change the setting so that the tablet does not map to your screen. Then, the mouse behaves just like a typical cordless optical mouse.