pnp,
The only way I can imagine you would be able to do this would be to
implement your own Graphical Identification and Authentication dll (GINA).
This dll will have methods in it called when winlogon is executed (when the
user logs in and the session expires).
However, implementing your own GINA is no small task, I wouldn't
recommend that a product depend on this on a regular user's machine (it's
usually used in very regulated environments with extra security
requirements).
Also, you can't implement a GINA in .NET, since you can't export
functions from .NET assemblies.
Hope this helps.
