Original website: https://web.archive.org/web/20031009221814/http://linux.sprig.com.au/
cnslock is a dock application (dockapp) which provides a visual indication of the states of the three “lock” buttons (caps, num, and scroll).
For comments, see the original dockapps.org entry.
A newer version may be available in the Window Maker dockapps git repository:
git clone https://repo.or.cz/dockapps.git