how to add counterions ?

From: yxiong_at_mail.ccnu.edu.cn
Date: Sun Nov 30 2003 - 04:59:36 CST

Dear sir,
  I see some refenrences that when the protein is charged (not neutral) in MD
calculation,some counterions are added to neutralize the system. Do you know how
to do this in NAMD program?
  Thank you for your clue!

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