Does Isolated Storage have to be restricted to a user?

I'm a little unclear.

Most of the articles I've googled say yes, users cannot share isolated storage files, but not all.  If it is always by user, why would they include "user" as one of the scope enumerations?  What effect does it have?  What happens if you use GetMachineStoreForApplication()?  Does "user" get tacked on automatically, whether you want it or not?
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Bob LearnedCommented:
Have you experimented with the different scope levels to find out?  It is my understanding that isolated storage can be scoped to different levels.  If you are having issues, then you should explain how you are using isolated storage.

Use of Isolated Storage (A Simple Demo)

Members Name	Description of the Use
------------    ----------------------
None	        No Isolated Storage Usage
User	        Isolated Storage scoped to User Identity
Domain	        Isolated Storage Scoped to Application Domain Identity
Assembly	Isolated Storage Scoped to Identity of the Assembly
Roaming	        The Isolated Storage Can roam.
Machine	        Isolated Storage Scoped to the Machine
Application	Isolated Storage Scoped to the Application

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