Global Content - How does it work its magic?
Global Content uses PHP on the server to import the global pages and insert it into the page source before it served up to the browser. For speed, the global pages are cached so that they do not need to be reparsed with every single page view. However, whenever the stack detects that the global page has been modified, then the cache is purged and the global content is parsed again to create new cache files.
Now go forth and make your websites great!