Hi Kenneth,
it's not working like you think.
A field "Global" like you said, is a field created from the fields manager or from a content type with the padlock open.
This kind of fields are stored in the table :
- if the storage is article : #__cck_store_item_content
- if the storage is user : #__cck_store_item_user
Like it is in a common table, those fields are available for every content type. But it mean, that every time a content from those content type is created, an entry is added in the table above.
But it doesn't mean that you can get in an article, data from the user.
Fields for User profil must be in the content type user and are not available for article.
Best regards
Lionel