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@lae
Do you mean the headset cups? They look like this
http://www.bikemagic.com/news/images/headset_cup_remove.jpg
There's one on the bottom of the fork steerer tube too. They're pressed on. The most common tool to remove them is a pipe with a flared end like this:
http://s.wiggle.co.uk/images/cyclus%20headset%20cup%20remove.jpg
You can make one really easily with a bit of pipe and a hacksaw. Put it in the frame, gently tappy tap with a soft mallet and out come the cups. It's a good idea to give them a few hours (or overnight) soaking with preferably Plusgas, or WD40/GT85, just in case they've been in there for a while. You can even use a big flathead screwdriver, although there's more chance of damaging the cups.
The one on the fork can be removed with a ring-shaped tool, or a big adjustable spanner placed over it (wrap it in old inner tube to stop it scratching the cup), and again gently tapped with a soft mallet.
To reinstall, support the frame or forks on a block of soft wood, and just tap them in with the same soft mallet. Grease them first.