Access and password changes

Changing the password of the 'schema owner' - the owner of the data.  

I have a manager who has asked if there is a way to track what 'application' is logging in before changing the password so that the change can be smoother. (either change the password in the app or create a new account for the app).  

The second part is can you track what application is attempting to log in to a schema where the password has already been changed.    

The version of Oracle are 9, and 10.  

A case where the password has already been changed happens to be Oracle9.

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