> > -1- how can I restrict the access 
> > of a certain user such that he can only see certain logbooks. 
> 
> This can be achieved with the "Login user = ..." option.

That is what I found in the mean time. And it works like a charm.

> 
> > But also not showing the other logbooks on the selection page.
> 
> You could try to use "top groups". This gives you "separate" groups of logbooks, so you could make a public tree
> seen by everybody and private trees only seen by a few people. Please read the documentation for details.

I'm now using this (I had to redesign our tree for that)

> > -2- How can I have a login page instead of the logbook selection page.
> > When I insert the password statement the config, I get a blank page.
> 
> You get a login page instead of the selection page if the "Password file = " statement is in the [global] section
> and "Protect selection page = 1". You might have to delete all cookies in your browser if you move the password
> file statement between the [global] and the logbook sections, because otherwise the old cookies might prevent you
> from logging out.

This is not working for me, in Mozilla Firefox I'm still getting a blank page, where IE is giving me an error
stating
that the page is unavailable