What is an accesskey?
An accesskey is an underlined letter in a web page, menu or dialog that indicates to a user a quick, keyboard method of simulating a click on that element. For example, an Apply button may have the letter A underlined. On Windows and UNIX, pressing Alt+A is a convenient way to push that button. On Macintosh, accesskeys are available only in HTML not in XUL, and they are activated using Ctrl+letter instead of Alt.