Before logging on, if a user triggers an action in the GUI that causes
my application to try and open a query the error message I am getting
is (approx.) "Your user name and password are not defined etc. etc.".

What I would expect (and want) is "You have not logged in".

On a related issue, once having logged in and then out again, a
similar action makes IBObjects re-connect silently with the prior
User/Name password. Obviously not what I want (for security reasons at
least).

Am I missing some obvious property value in IB_Connection?

Thanks,
Clive