WMS question

[rock well]

Hi all, i have a question in WMS, can a polygon be hightlighted in a map in wms server, like can anything be included in the url that makes a certain polygon marked, for example i want the border of the polygon to be highlighted .... i was able to do it in mapscript but was wondering if the same thing can be done in WMS ...
   
  one more thing, i am not pretty sure what query layer does in wms ...
   
  Thanks for your time
  kris

 		
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