How to identify RDP client version of connected users

All,

we are in process of migrating to RDSH 2012R2. However we are running into some strange issues.

Is there a way to determine what RDP version clients that connect to our RDSH 2012R2 farm are running? We have a mixed environment of ThinClients and Laptop/Workstations. It would help me if there was a way to retrieve the RDP client version for those connected users.

Thanks

Danny