I'm reading about 
folder structure and export/import, and I have a question:  Where should I place the file(s) for a user control that is 
not registered as a web part?  Does the appropriate location change based on whether it's used on a specific site's page templates versus multiple sites' page templates?
So far, here's what I'm thinking, based on the documentation:  If the user control is only for a particular site's page templates, then it belongs in `~/SiteCodeName`.  If it is used in multiple sites' page templates, then it belongs in '~\CMSGlobalFiles`.  Am I on the right track?