There are several ways to take care of updates. Once you're online, with a default FC2 install you shold have a little blue circle with a checkmark in it that will change to a red circle with a bang in it when there are updates available. This is the RH/FC up2date program. Click on the button and follow the directions and you will be updated.
A better IMHO wat is to point your web browser to:
and download and install the apt4rpm program. This is a command line updater and there are tons of sites that will give you help on using it or you can access the man pages (man apt or man apt-get) for directions on how to use it. If you're a "point and click" kind of guy, once apt is installed, type the following commands as root:
apt-get update && apt-get dist-upgrade -y
and sit back and wait for the magic to happen. Depending on how you access the internet (dialup or broadband) this could take a while. But when it's done, type the command:
apt-get install synaptic
and the Synaptic GUI updater will be installed. From then on, you can point and click your way to new free software, updates and etc. with all dependency issues automatically resolved. I'm pretty old and not too bright, so I stick to the command line... the GUI stuff just confuses me.
PS: Just rereading your message... if you meant that you wanted the computer to do the updates with NO user interaction, yes, that can be done by setting up a cron job. If that was your question, let me know. That's no biggie either.