manipulating other user's sessiondata

[eluser]Marc Arbour[/eluser]
Hi.

I need something rather special: an admin must manipulate other users sessiondata live.

Is there a way for me (the admin) to change one user's sessiondata (in the db) in real time?

Example: my boss isn't there and I need this one time access to that controller to do something -> Wham! inject the user permission to access the said controller in his sessiondata.

Any pointers will help.

Best regards.