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Sending a message to an IPAddress over the net

I want to send a message in the form of a messagebox with yes/no buttons to a particular IP Address which I trapped through Remote_Addr Server Variable. How do I do that?
I also want to trap the values -Yes and No and display a corresponding message back to the comp. which sent the message box.
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In what format is the message supposed to be in? What kind of program is to receive the message?
chikkiAuthor Commented:
The message is to be displayed in a dialog box at the target IP Address in browser window.
The chat program has to receive the value of  button selected (yes/no for example). And proceed to show a different page for yes answer selected and a different page for no answer selected. These pages have to be shown on target IP address.
Dialog boxes are poped up from javascript and the returned value can be placed into a form field and submitted back to your server.

However this is nothing to do with the IP address.

If you are attempting contact someone who has connected to your site in but not in respect of a HTTP request from them then it cannot be done within HTTP as the request from the client ALWAYS precedes the response. Moreover if a proxy is in use the the IP address that you are seeing is that of the proxy and not the client and many clients could contact you with the same IP address if they are using the same proxy.

chikkiAuthor Commented:
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