Off topic ... blocking chat programs

[Irfan GM]

Title: Off topic ... blocking chat programs

  Hi guys ,

 Slightly off topic , but chose this forum , hoping for an answer.
 My question is how do i block chat programs like icq, msn messenger etc .
 I have windows 2000 domain with no proxy server , can i do it using DNS server ?
 so that all these chat programs resolve their respective ip addresses internally ?

 Thanks
 Irfan

 
 

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