How To Search For A Logged In User And Access To His User Data?

Hi, how could i search for a particular logged in user and access to his user data.

For example, user BOB has some value at Yii::app()->user->runtimedata. The data is only available after BOB logged on and did something and it’s not stored in db. I need to create an admin page where the admin could search for BOB and view his runtimedata.

Thanks for helping!