Msn Block Detect 0.5 How Can I See Whether Or Not Someone Is Being INVISIBLE Or Has BLOCKED Me On MSN?

How can i see whether or not someone is being INVISIBLE or has BLOCKED me on MSN? - msn block detect 0.5

I know there is a way to do this. For Yahoo Messenger, a program called "Buddy Spy is you can write your screen name and recognize the true status of the connection. How do I know if someone is invisible or blocked me on MSN?