how to run two different version of oracle on same windows server

[prav_saras]

well you need to sort the clients ou as they are unable to resolve the tns name - sort out your tnsnames.ora files

Hi,
Thanks for yr reply.
sqlplus is wroking, but not able to coonect by using anyother software.
Is there anything about the tnsnames.ora?
There should be one tnsnames.ora or can have two tnsnames.ora,
coz i guess there is something wrong with it

regards,
praveen