> One of the apps I've been developing uses the
> embedded Firebird. I've copied Firebird's DLL and
> the other recommended files into the app's debug
> executable directory.
>
> I call database IBPP::DatabaseFactory() with
> a user name and password, and calling Create(3).

Ensure your application load fbembed.dll, not fbclient.dll.
Ensure you use local protocol to connect to database.

> An exception is thrown with the following text:
>
> Your user name and password are not defined.
>
> A Firebird Service is running on my PC, but
> that's nothing new. I've been able to develop
> an app using Embedded Firebird and another app
> using Server Firebird before.

What if you stop Firebird Service ?

Regards,
Vlad