The "Global" aspect was key. GM tried to unify North American, European (Opel/Vauxhall), and Asian (Holden/Daewoo) part numbers into a single logic system. If you booted up the 2011 version, here is what you would find:
In 2011, GM was in the middle of a massive consolidation. They rolled out (and continued refining) the . While the "Global" branding started earlier, the 2011 version is widely considered the "coming of age" release for the platform. GM Global EPC -Electronic Parts Catalogue- 2011
Disclaimer: GM has since migrated to web-based platforms like "GlobalConnect" and "Parts Workbench." The 2011 EPC is legacy software but remains a useful reference for vintage GM repair. The "Global" aspect was key