Active directory allows single user to logon to multiple way how to monitor

Windows server 2008 Active directory Domain.
By Default Active directory allows single user to logon to
multiple computers simultaneously for example one user (USER A) can logon to COMPUTER A and simultaneously he can Logon to COMPUTER B also without logging off from COMPUTER A.
Now Computer A , B have local profile for user A which is include mail box for audit purpose  I want to check
the Domain Users to logon to multiple computers even he can access via  OWA 
simultaneously, without restricting them to logon to some particular systems I want to set them free to logon
to any computer in domain but monitor their logon session and logoff time. if user A try to login to new pc as admin I received a notification if some one connect via OWA its time of login and IP address should be monitor.   

Shoaib Saeed