Touch Coordinates without e.stageX and e.stageY

So I have a virtual camera, and eventually I get off the stage.  I used to use e.stageX and e.stageY to get the coordinates of the touch, but I cannot do that anymore because I am no longer on the stage.  How do I get the coordinates of the user's touch when they are not touching the stage?  Surely there is a way, because if there wasn't, I'd have to come up with some extremely - difficult equasion, right?  But I want the simple way, or at least adobe can make a keyword for it, because I cannot rely on the stage for everything.