As an administrator of an xwiki, I often find myself debugging permissions problems.  When this is done over a wide area (say, the person being in the UK, and I’m on the west coast of the US), it is very problematic.

It would be really nice to see what permissions a particular user had on a page, or to “become” the user in question and see it for myself.

Is such a function available, and if so – how can I use it?

-Adrian