Windows 7: Remote desktop end user session

Hello to all,
I'm new here, and i would like to say that i have learn a lot of useful things about Win 7 from here, great stuff,....but...there is one thing i didn't found, not even after i have google it for almost 1 week and checked almost all the topics with "remote desktop connection":
My question (and my problem) is:



In Windows 7 (i don't think the version it's important here), how can you end a user session when you log in remotely with the default administrator account?

I'm not meaning about enabling Concurrent Sessions. What i'm trying to ask is like Windows XP. When i remotely connect he tells me that another user is currently logged in and i will terminate his session.
Something like this....

Thanks in advance for your time and excuse my poor english!
Cheers,
Flo