Is there GUI functionality for tabbed windows? I want an information screen with different tabs that display different aspects of info about an object? Do I need to build something like that using GUI elements, or does something like that already exist? If I have to design it myself, any suggestions as to how to do it?
You’d have to build that yourself from the available GUI components. GUI[Layout].Toolbar may be a good starting point to represent the tabs. Check out the GUI Scripting Guide for information on implementing composite GUI controls.
An alternative would be to take a look at one of the more high-level GUI libraries, like GUIX, EasyGUI or GM2; those may already provide the kind of composite controls you’re looking for.