Getting information about a certain user's activity

Dear list readers, since I have a user on my system who keeps playing around with my nerves (tries new security holes a.s.o.) I'd like to keep track of his activity. The user logs in using a SSH connection. I'm root on that server. I'd like to see what that user sees on his console. Is there a way to get the same screen the user has? Something like tail -f /dev/pts/0 (which doesn't work)? Thanks in advance, Andreas Achtzehn -- /------------------------------------------\ | the linux-society Andreas Achtzehn| | visit us at www.linux-society.de| | or call (+49)179-4948706| \------------------------------------------/