Oracle search path Instant Client vs. full client

[Bill Vlahos]

We have an application which queries an Oracle data base.

On Windows we have the Oracle Instant Client files local to the .exe  
file and it works fine. However, if a user also has the full Oracle  
client installed, the connection string fails. It looks to me like  
the local files are not being used.

Could this be a path problem? Is there a way to point to the local  
files instead or some other solution for this?

Bill Vlahos