[users@httpd] Questons on Server

[David]

Hi guys, I am really new to the Apache and I would like to do the following:-   Introduce password authentication access for some of my sites on my web folder (i.e. htdocs/). How can I do that ? What do I need to configure my config file to make it work ? I would like to know who is currently accessing my server / website ? How can I do that? Is there a feature which I can query my server to find out who is currently accessing my webpages?   Thanks! Regards,david