After conversion, the PAGEDOWN/PAGEUP keywords are represented as a push
buttons on the Web page. These buttons will replace the use of the Page Down/Page
Up keys on the user's keyboard. If PAGEDOWN or PAGEUP is disabled in the DDS
source, no push button will be placed on the converted Web page for the disabled
keyword. The optional text is ignored by conversion, however, it is still
included on the list created at program compilation time to explain the intended
use of the indicator. This text has no function in the file or the program
other than as a comment.