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# <a name="Rationale"> Rationale </a>
In [[CapabilityBasedMicroKernel]], an application might be used with the very minimal set of capabilities that is needed to execute it, that is read-only access to it's libraries and files, plus maybe access to a specific IP connection or configuration directory.
Thus when the user asks to open or save a file, the dialog used to choose the file could also serve the purpose of granting the appropriate capabilities to the application.
This dialog is named the powerbox.
## <a name="Links"> Links </a>
* [Plash powerbox](http://plash.beasts.org/powerbox.html)
* [E and Cap Desk](http://www.combex.com/tech/edesk.html)
* [Polaris: Toward Virus Safe Computing for Windows XP](http://www.hpl.hp.com/personal/Alan_Karp/polaris.pdf)
-- [[Main/NowhereMan]] - 28 Apr 2006
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