what would be the easiest way
 

What would be the easiest way to track everyone who is logged into the admin control panel and put all the IP addresses and usernames (if they have one) into a page on the admin control panel?

I need this for the Fake AdminCP that I am doing

Just to get a good understanding, you mention IF they had one?

When a user logs into the Admin CP they should at least have a Username:IP Address?

I'd trying looking at the Statics Log and try looking at that code and working from that.

Its a fake admin control panel, for tracking if hackers try to break in to it, so there is no security on it at all.

Some of the users wouldn't have registered on the site, so I would only get their IP address

Ah I get you!

I could only suggest making the login in like a contact forum and then they login and the details get sent to your email and using another PHP code the grab IP one and the email would be

User:
Password:
IP:

I could make a code up for you if you want this up to you.

EDIT: When they login you can redirect them to fake_acp.php or w/e.

That could actually be a good idea. Would need it to be the same as the Admin Control Panel login.
If you have MSN add me, ukwam@live.com - would like to discuss more :)