How can i make multiple oracle homes co-exsist on windows

I have a windows box on which I have just installed oracle 9i and 10g.
Whenever I connect through the sqlplus , it defaults to the first one installed which is oracle10g every attempt to connect to the second database which is 9i keeps coming with “ORA-12154: TNS: could not resolve the connect identifier specified”
I know on unix I can easily set my environment, I will like to know how to get my environment set on windows for me to connect easily to the two databases.
Thank you for your time
bekky

Yes, they must be in different homes. The 'definition' of an ORACLE_HOME is the software for one product at one version/patch-level.
The easiest way to do what you want - search for all the TNSNAMES.ORA files and make them the same. They will be in each ORACLE_HOME/network/admin directory.
If you intend to have multiple homes for a while, the smartest way (IMO) to do what you want is to study the custom installation capabilities of the 10g installer and install just a listener in a new ORACLE_HOME. Then add a TNS_ADMIN variable to point to the central LISTENER and TNSNAMES.ORA and keep just that one TNSNAMES.ORA file up to date.
Takes a lot more effort up front but is easiest administrative effort in the long run. There is a lot of information in the Oracle Network User's Guide and Reference at http://www.oracle.com/pls/db102/homepage

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How can i make multiple oracle homes co-exsist on windows

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