In which C file/function ?

[Pratap]

Hi
  List
    Can any one plz tell me in which C file/function the code for marking
  symbol by color is written? At present after query by point, I can able  
  to mark the symbol red, but for any subsequent query the all the 
  previous query point is lost on the map. I want all the previous query 
  point to be in some particular color and my last query point should be 
  in red.

  Thanks in advance
  With regards
   Pratap 
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