How do I know who blocked me on yahoo Messenger?

How can I know, on MSN and Yahoo, if my Messenger contact is connected invisible or if she blocked me ?

Some of my friends, or some girls I met on the internet, seem to be NEVER connected. It's quite strange, I don't know if they don't have time to connect, or if they blocked me... Someone told me that it's possible to know it, especilly with some secret knacks that we can do on the hardware and the computer. How can I do ?
Answer:

Simple: http://www.msnblockchecker.net/ Glad I could help The site shown is safe and I scan it or spyware, none was found.

EL TURCO at Yahoo! Answers Visit the source

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