[CentOS] How do I Install and activate?

I have just installed CentOS 5.6 from disk and updated it.

1. I would like to use telnet on my local network. How do I activate it?

2. How do I install Mercurial? it is not in the repository.

3. How do I install eclipse? It is also not in the repository.

Thanks,
John

-- 
John J. Boyer; President, Chief Software Developer
Abilitiessoft, Inc.
http://www.abilitiessoft.com
Madison, Wisconsin USA
Developing software for people with disabilities