Scummbuddy, judging from what he wrote, I think he knew about that already, what he wanted to know was how to refer to variables which are accessible by BOTH text scripting and from Interaction responses.
In fact, I think the interactions can not access GlobalInts currently, instead, you need to use the Graphical Variables (see text script function GetGraphicalVariable(), unfortunately there doesn't seem to be a SetGraphicalVariable(), so you cannot change their values in text scripts at the moment, correct me if I'm wrong)