GDM and gdmchooser

How do I invoke the gdmchooser in order to choose which host I wish to login to? I can't seem to get this feature to work. Thanks, Scott

How to configure sendmail to relay messages to other servers.

How do I enable sendmail to sent to remote server? Local email works fine, but I need to be able to send messages accross the internet. I have added the MX Record to my DNS server, so what else do I need to do? Thanks, Scott

Configuring SSH

Is there a HOWTO on configuring SSH? I was wondering which file I need to edit to allow hosts using RSA-based host authentication to login - I receive a permission denied error when trying to login. Thanks, Scott