Can I Alias the DocumentRoot?

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http://serverfault.com – I have a web app (oldapp.com) that stores images in a sub-folder (oldapp.com/images) of the DocumentRoot (aka web root). I am rebuilding the app on a different domain (newapp.com) and have created a sub-domain specifically for storing images (images.newapp.com). While I am building, testing, and using the new app, I still need the old app to continue accessing that old image sub-folder. All of this is being done on the same server. I need the new sub-domain to have the same access to the images that are in the old sub-folder. For this particular case, I do not have the option of changing (HowTos)