Msn Block Detect How To Detect A Invisible Contact On MSN?

How to detect a invisible contact on MSN? - msn block detect

Ok, so I know there are many sides to recognize and remove or block u that'w but not what I want.
I have some contacts that I say with offline status, as you can, if they are invisible with offline status online.
No, if I avoid it or not! Only if they are hidden everywhere in the world ??????
Thank you!