How to monitor / shutdown processes and users?

Hi,
As you can see in my previous post i'm totally new to Arch and fairly new to Linux...
Here's one thing that bothers me: I don't know how to keep track of all running processes (and end them if needed... I guess you need to 'kill' them but you first need to know their name, right...) and logged on users (even though that's only me, heh...)
How can you do that in Linux? (something like task manager or another admin tool - or a command line version)
Another thing... I think a wiki page 'securing the default Arch install' would be helpful...
(flame me if there already is one, but I didn't find it )
greetings,
d.
(I think Arch is going to be the one Linux distro to break the record of 1 month installation on my pc... woohoo!!!)

Kern wrote:
processes man ps
Now only 2 questions are left: how to monitor logins, and how to secure Arch Wink
Arch Wink, is this a subrelease of Arch? if so i've never heard of it.
I really don't know how that ended up in my post especially because I use semicolon, bracket instead of colon, wink, colon for my smiley...
but as relates to securing Arch, of course I mean against network based attacks. The way you would try to secure Windows. I know how to own windows computers when I have physical access to them, and I guess it's the same thing with Linux pc's... but I want to feel secure that nobody from the internet is going to appropriate my box for illegal or other things, on those few occasions that i'm not behind a router/firewall (which I am not sure I trust either... it's a Linksys wireless/wired router with integrated firewall capability. How secure is that? I don't know!)
Is there no way to deny all other pc's access to this pc? It's a laptop, not a server, so nobody has business accessing it remotely anyway... Actually, this is one of the reasons I had an eye on openBSD secure as hell...
EDIT: since we're at it... another thing I don't find is how I can find out at what speed my cpu is running... is it going down to 600 MHz when Idle or isn't it? etc... That stuff is pretty easy to see in windows... must be feasible at least in Linux hey

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