(Word 2010) I have a created a template from a blank document; the file extension is .dotm because I want to include macros.

In the template, I have added a new tab to the ribbon and placed a new group on that tab. I have also added a test macro into the new group.

My question is this:
Why does the new tab, complete with new group and macro, appear in all new blank documents as well as any other existing documents.
Are changes to the ribbon treated as global changes or what?