How to stop multiple logins on Active Directory Server 2008 R2

Hi We have Server 2008 R2 as domain controller and using Xenapp 6.0 ,We want to stop multiple logins for users ,please help me as I'm not to familiar with AD.
SuperDKAsked:
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Aditya AroraNetwork & Hardware Commented:
hello,  

 In Windows 2008 R2
        Click Start > Administrative Tools > Remote Desktop Services > Remote Desktop Session Host Configuration.
   

Double click Restrict Each User to a Single Session.
Check Restrict each user to a single session.

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