[rules-users] Facts with "from"

I am trying to understand the usage of "from". Do I take it that facts that come from a "from" CE do not actually get asserted into the WM? I would like to be sure because the facts that I would like to fetch with "from" are actually the same Java class as one of my WM facts but I do not want the "from" facts to be treated the same as the ones that are in WM... I do not want them to fire rules that the "normal" WM facts would. Chris