No I didn't rename the windows server.

I have couple of SQL Instances running on the server.

I have a one named instance running on this computer, which i want to change.

I don't want to change the server name.

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If this is not the solution then i can create an alias for the server. This i want to do it on the server, i dont want to do any settings on the client computers.

Bottom Line :

-We want to shutdown the Live Server (SqlLive)

- On the Test Box : Rename the SQL Server Instance name to (SqlLive) OR Create an alias SqlLive

- Test the Applications using the Test Box.