Basically, you had two ultimage.cgi files each displaying only the category numbers you wanted them to. That way, you could have one set of forums on one page, and another on the second page. For any sites with a lot of forums, it is a nice way of separating the categories and introducing sub-categories.
So in answer to your question, yes, you had complete control over which categories or forums were displayed on each page. These are normal, public forums viewable by all members.
Pure class
