How to use Multiple Homes on Windows Box for patching

Reading an Article by Arup Nanda 04.23.2007 talks about using multiple oracle homes for patching. We've installed oracle again and now have 2 Oracle Homes (db_1 and db_2). If I look at my service startup for the database I see this:
c:\oracle\product\10.2.0\db_1\bin\ORACLE.EXE TestDB.
If I try and start my database out of the db_2 install I'l receive errors about the init file not being located in the db_2 location. Should I copy all my files from db_1 over to db_2?
thanks.

I'l receive errors about the init file not being located in the db_2 locationYes, of course. Otherwise the Oracle Home will never know the location of the init.ora at the old location.

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