This form allows you to control most of the available options of the CGI script. Not all combinations of options work exactly as you might expect; for example it won't put zhuyin in the status-line, and it won't do dictionary or audio links while appending a word-list.
For a simpler interface, use the simple form. Of course.
The best feature of this script is probably the JavaScript tooltips, and I'm afraid they only work with Netscape 4 or MSIE 4. Probably a bit better with Netscape than MSIE. The other features should work with other browsers, of course.