Is there a way to see if someone actually gained access to my AdminCp?

One of my Mods said some Guest Accounts showed Admin Control Panel as their location on the Whosonline page.

There were four different IP's shown (all taiwan) and later two more (both taiwan IPs) shown as Admin Control Panel Login.


So, how concerned should I be?

Ask him if they had a Stop sign or a lock on the right side of where it says there Location. This happens to me when I'm in my admin panel and Google Adsense jumps on my board, they try to get into the admin panel, since I'm in there, but they have either the lock or the stop sign. The Stop sign is a no access symbol and the lock is a forum closed sign.

argh!! Yeah, I asked, but he is in England and I won't hear back until later tonight. I told him to take a screen shot if he sees it again.