logging what happens on a machine

[Yuri]

I have recently set up a linux server running Redhat 7.2, I would like to be able to keep an eye on the server and find out what is happening on the machine. Is there a log file already which I can read or do I need to set up logging somehow.
Thanks in advance for any replies.
Yuri.
EDIT: I would like to know everything that is happening on the server, even if someone logs on.

[mikek147]

Almost all logging is done in /var/log. Two, of the many you could monitor would be syslog and messages. Hope this helps. -mk

[Yuri]

Thanks I will have a look at those two logs, I used to run Mandrake 7.2 and that had a log program where the system logs could be read from.
Yuri.

[nightmareDNS]

if you want to monitor continuously, as in sit in front of the computer and watch, you can use

tail -f /var/log/messages

or /var/log/security, or whatever you want to monitor.

[Yuri]

nightmareDNS thanks for your suggestion I will probally end up doing that. That will be helpful as I have a dialin connection to a cisco 2511 router and can sit down during the day and watch the log files.
Thank you for your help.
Yuri.