After having read the all discussions, i still don't have my answer ...

I want to index files that are protected at the filesystem level. the
security on the files are
based on NT authentication.I will offer the access to the search through
a web application
that requires to login, and the authentication is again based on NT. So
the user logged
in the web application should see the files on which they have read
privileges.

If a user do not have access to a file, will the search engine return to
him the link to the
document that the user is not allowed to read ? How do i configure the
indexer ?

tanx in advance maxime