GBX.lua.CoreGui (Service)
From Goodblox Wiki
Preliminary: This item was still under development in this version of Roblox. Use only for experimental work.
Note: This is a Game Service, and therefore isn't like other Objects in the Class Explorer. You have to call it with :
game:GetService("<Service name>")
The CoreGui is... something. Who knows what it did in 2010?
Functions
The CoreGui object only incorporates the global functions.
Properties
The CoreGui only incorporates global properties.
Events
The CoreGui object only incorporates the global events.