GUI Grouping

So, this started as a question on Unity Answers, but I would like to go more in depth, so I’m turing it into a thread.

you can further read the conversation here:

http://answers.unity3d.com/questions/45884/two-unity-gui-questions

I have followed the directions in the second answer and have made a group and such. Now, my question is how would I use camera.WorldToScreenPoint to make the GUI move? I mean, I know I animate an empty and stuff and set the target variable, but after I do that, how do I refer to a specific GUI group?

That is my real question here - How do I refer to a specific GUI group?

GUI group need to use a specific Rect, Use camera.WorldToScreenPoint as the Rect’s position. When your target move,then Rect move,so the GUI group move.

Yes, but how do I name the Rect?