Malware Removal

http://answers.yahoo.com/question/index?qid=20110528163854AAL9Uyp

http://forums.techguy.org/virus-other-malware-removal/998486-dhl-windows-xp-recovery-virus.html

Limit concurrent session in linux

Check the file /etc/security/limits.conf. 

* hard maxlogins 4    (The asterisk means global. 4 is the number of concurrent logins.)


Eg.
         @users  hard  maxlogins  1

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Thanks
System Admin
TIST

Disconnect users in Linux....

who -u


kill [pid of user]