How to restart X server

Tue May 11 03:02:01 UTC 2004

hi,
   I changed resolution and should restart X server for the changes to take effects.I don't know how to restart X server except rebooting the computer.Some users have connected to the server,and rebooting will cause some trouble. 
   How to restart X server without rebooting.
   Thank you very much 

              Huan Deng
              hdeng at microscience.com.cn
              2004-05-11
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