I've been poking around among WindowMaker's dockapps, and finally found a desktop pager that I like (wmpager). I duly installed it, disabled the Clip, and have all my apps attached to the dock. However, I liked the clip's ability to have the icons on the top of the screen, and this page
says that the dock can be made to be horizontal, also. Has anyone successfully done this, or was it just a typo?