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I remember that in Typo3 CMS administrator was able to switch to particullar user ("simulate user") so he can see exactly what that user sees. I'd be glad to have such option in Cireson portal, too.
There are situations when I need to check if scoping/permissions were applied as intended and puting some test user into same AD groups as desired user is not very comfortable nor precise (user can have some access set directly, not using group).