Possible to use 2 tnsnames.ora for just one client?

Hi,
in our organisation we have two different tnsnames.ora files. This because of the
fact that there are remote locations each with their own IT department. Each department maitains their own databases, but applications are spread over the whole organisation.
What I would like to to create is a tnsnames.ora in which there is an e.g. include c:\oracle\tnsnames.ora and include c:\oracle1\tnsnames.ore. Would that be possible?
Fred

If what you want to achieve is a situation where different users use the same PC, but you want to limit the tnsnames they have access to, what if you try setting the TNS_ADMIN environment variable to point to the permitted directory for each user env profile.
e.g
user1
TNS_ADMIN=c:\oracle\network\admin\user1
c:\oracle\network\admin\user1\tnsnames.ora
c:\oracle\network\admin\user1\sqlnet.ora
user2
TNS_ADMIN=c:\oracle\network\admin\user2
c:\oracle\network\admin\user2\tnsnames.ora
c:\oracle\network\admin\user2\sqlnet.ora
etc.

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