1st Solution:

LimitLogin
Ever needed to limit concurrent user logins in an Active Directory® domain? Ever wanted to keep track of information about every login in a domain? If so, LimitLogin is for you.

More info: http://www.microsoft.com/technet/tec...t/default.aspx

Installation procedure:
http://www.windowsitpro.com/Article/...993/47993.html



2nd Solution:

UserLock
UserLock limits the number of simultaneous connections under the same user name on an entire Windows NT/2000/XP/2003 network, restricts the computers where users or groups can logon and provides administrators with an accurate real time picture of connection activities across the network.

More info: http://www.isdecisions.com/index.cfm...ducts-UserLock



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