Okay, I *had* looked at this, I just hadn't understood how to use it. Here are a few questions which the reference doesn't seem to answer, if anybody knows?
1) Game object can be anything? So I can embed the tooltip into the object itself, and not have to do anything with the mouse?
2) If I use GUILayout Begin Area Follow Object, is GUILayout End Area required, or optional? EDIT: Discovered this was mandatory or it gives you a GUI push/pop error.
3) Finally, if I destroy the game object, will it also destroy the attached GUI?
If, for example, my object is at 0,0,0 and scaled 138,91,1; do I still have to set the offset for screen left and top? Width and height of the area would be 138 and 91, yes?
Thanks again! I finally feel as if I'm on the right track!