Which client's Tnsnames.ora will work if you have multiple oracle11g clients installed?

If we need to install multiple Oracle clients, which client's Tnsnames.ora will work?

The answer is:

After installing the clinent end, the installer will put the client's Bin directory in the path, the path in front of the client will be searched first, where the Tnsnames.ora will work, the latter clinent will not work.

%oracle_home%\bin There is a oracle.key that specifies which of the oraclehome in the registry contains all the settings, including Nls_lang, for each oraclehome in the registry.

I installed a ODAC client in the Windows Server R2 system where the Oracle servers were installed, and the client installed later worked, and it also copied the configuration from the previous client's Tnsnames.ora.

Which client's Tnsnames.ora will work if you have multiple oracle11g clients installed?