http://qkpm2ov2rjhjkhfsftskqho77uj5rewd5y44unkf6cb7tdhaxwcvh2id.onion/books/dbpf/Type%20Group%20Instance%20-%20SC4D%20Encyclopaedia.html
While efforts are generally made to prevent two objects from having the same TGI, this still sometimes occurs, and can cause conflicts or bugs in the game, particularly when it happens with buildings, props, or textures. Sometimes, particularly in the case of mods, it is desired to give an object the same TGI as another, so that one will override the other.