Codex is a toolbox application for displaying a series of
Drawfiles (pages). Clicking Select on the iconbar icon will
either show the first page, if none is displayed, or
replace the current by the next page. Clicking Adjust on the
iconbar icon will display the last page, if none is displayed,
or replace the current by the previous page.

The pages, and this Help file, are in a subdirectory "page" of
!Codex. There must also be a file "index" listing the
pages in order.