Policy
		The Policy object: How do you get/set permissions? Start with a permissions file, which we'll talk about later. The Policy class will then read these permissions.  You can intereact with this singleton class via: getPermissions() - get the permission sets. getPolicy() - gets the Policy singleton (a static method) refresh() - reloads policies. The action this actually takes depends upon the underlying mechanism that is storing the policies - it could be an ASCII file, a database, or some type of serialized stream. setPolicy() - sets the Policy singleton to a different Policy object, perhaps a custom made Policy object.  Talk about design pattern! However, you have to have permission to reset the policy object, you can't just overwrite the existing object on a whim!  Permissons