Invisible Yahoo ID Detect by PHP

Hello , anyone got a suggestion on Invisble Yahoo ID Detection ? I have visit this website
[URL REMOVED]It works very good !!!! I think the developer connect to yahoo with his ID and send request to server , then Yahoo returns result . Anyone had a suggestion on this ???

maybe http://developer.yahoo.com could help you?

Uhm thanks but i don't think Yahoo will give out the method to detect invsible user and which is the method to break stealth setting

And we will not help you to violate Yahoo's TOS. You are also now in violation of our rules. I would suggest you not break our rules again. I would highly recommend that you read them.

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