2008 R2 Remote desktop services login issue

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http://serverfault.com – I have installed and deployed a remote desktop services env , no background in this application at all, so its been trial and error.. Setup in a hyper-v clustered env. I've migrated all 30 users now and tested their logins. I was asked to check something recently and when i clicked into the hyper-v session, and selected the server..e.g. server2 it had the users active session displayed, I thought I would have been prompted for the ctrl-alt-del screen etc I haven't tested this with anymore than one user yet and I think I may have forgotten something, as i don't know why I was able to click in (HowTos)