Converting my web pages from NT 4.0 to RH 9.0. Manage to move the pages, and fix the hyperlinks, but I have some sections of the web pages that need access to only certain groups of people, so I need web pages that can be only accessed by passwords. I do not know where to set this up.

Assuming your using Apache webserver, you can manage authentication with .htaccess or config files. Here's a link that describes them in detail

Authentication in Apache: http://httpd.apache.org/docs/howto/auth.html

.htaccess description: http://httpd.apache.org/docs/howto/htaccess.html

Hope that answers your question

PS. If your new to linux, install webmin (http://www.webmin.com) on your server to help you configure these things.

Yep.