Okay, now that I'm done with my little lecture for the day, let's see what we can do to help you with some possible other options besides Yahoo! chat servers. If you'll tell me a little about your app (for instance, exactly what it does, what it's technical requirements are (such as why you absolutely had to use Yahoo!'s chat servers) and any other details you can think of), maybe we can find an alternative workaround in order to get your app up and running. I'm sure there are other ways to get it running without having to use Yahoo!'s chat servers. If not, then maybe I need to break out another lecture on application design and how you should never design a piece of code that can only work with one and only one specific resource (especially when you don't own that resource and aren't sure it will be available to you). After all, this is the Internet, remember? There should be hundreds of possible ways to do what you're wanting to do. We'll just have to find one that is feasible for you.
Mike
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Michael Hall
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Thanks, mhall6520.
I'm Really happy that you are going to help me.
my project is this:

It is a better version of "http://webmessenger.yahoo.com/".
Very Very Better!
webmessenger doesn't have Buzz either!
but it will be like the Last Yahoo! Messenger with that skin and Will do, what the Messenger does.
it will not be a limited version of messenger.
it will be a portal version of that messenger, in WEB (You can have the messenger with 200KB of transfer)
The Problem:
Connecting socket to a server (JUST IN FLASH!!!) , needs that #%#%$ xml file!
My possible ways:
1-(Good) : Negotiating with Yahoo! developers to place that file
2-(Bad) : To use another programming language as a 3rd party socket server
Means, I connect to (for example) an ASP.net Server to have an async socket.
I wrote this code in PHP, too. but there is a problem.
PHP doesn't have async socket and threading and it is not a 2-way language.
3-(Ugly) : To write a PacketSniffer (for example) in VC++ that listen to the Yahoo! Chat server's IP and when received the XML Request, delete that packet and reply the XML file.
But I am ready to listen to your ways.
Thanks again.