How to check who else accessing your gmail account

It was a relief knowing the new office allowing access to web based emaisl such as Yahoo Mail and Gmail particularly. But unfortunately, access to Facebook is blocked
although I prefer Gmail over Facebook.
So when I’m back home I notice that my account is still open on other location, which is at my office’s desktop.
![]()
Click on ‘detail’ link which will open another such as below. It shows who and what accessing your Gmail account. If you feeling unsafe, just sign out all other sessions.

erk..biasanya, kalau ada orang penah access akaun aku, itu maknanya aku dah tak dapat login akaun aku la..
I have seen the same feature in AOL mail and I think it should be implemented everywhere in all mail around the globe. I didn’t know it though that it is available in Gmail.