wmDockApp is an empty do nothing dockapp that draw a black rectangle that is 54x54. The only functionality is that it handles expose events. It does however come with wmgeneral and has many of the functions needed for a typical dockapp already written. The developer need therefore only write the actual useful code for their dockapp and the rest can be ignored. This app is therefore a good starting point when writing a new dockapp.
For comments, see the original dockapps.org entry.