How can I hide user info for guests?

I'd like to hide ALL information about members, groups, legends, "who is online", statistics etc from the first page.
All this should appear only after log-in for registered users.
Is it possible?

Change the permissions so Guest can see nothing

Thanks for your reply but can you be little more specific?
So far I have found the way how to close all the topics and discussions but all this "who is online" info stil stays on the first page for everybody.
On the first page I'd like to have only forum logo and link "Log in"... nothing else!
Can I do that

go to forums.. manage.. and modify the permissions =)of course this is in your admin panel

Ok, found the solution. I had to close ALL the topics on the first page.
My initial idea was to keep one public forum open for everybody but all the rest of the topics for registered members only.

You can do that too with foruml permissions