Hi owd,
sorry, i think we don’t understand each other.

(i’m from germany, maybe i should improve my english).
You must insert a new page in your document with a ditto call, described earlier. This page has an id and this id you have to use in your cumulus call. The cumulus can be in a sidebar, in some documents, everywhere you want to show the tag cloud.
If your cumulus call still looks like this:
[!cumulus_swf? &parent=`0` &landing=`99` &tvTags=`documentTags` &tagDelim=` ` &wmode=`transparent`!]
a click on tag in tag cloud would try to open the page with id 99 (and show the result with ditto’s help there). But if you doesn’t have a page with the id=99 you’ll get a 404.