help

I'm assuming that by "cp" you're referring to a PC:

Bluetooth or infrared (IrDA). For more, start by reading the phone's User's Guide:
http://www.nokia.com/nokia/0,,42280,00.html

Then info about PC Suite:
http://www.nokia.com/pcsuite

You can also register as a user on this site and search for the numerous posts already discussing this (search for, e.g., "Bluetooth", "6600" and "PC Suite"😉:
http://www.allaboutsymbian.com/forum/search.php

Also, a more descriptive subject/title than just "help" next time you post would be nice. A simple one, like "How can I connect my 6600 to a PC?" would help people decide whether your post is worth reading or not.