dual home oracle upgrade question???

We have ORACLE 9ir2 and 10gr2 on same Linux server.  We plan to upgrade ORACLE 
software from 10.2.0.2 to 10.2.0.3.  I know I need shutdown:
   
      .  listener
      .  All 10GR2 databases.
   
  Do I also need shutdown ALL 9iR2 databases?
   
  Thanks.

       
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