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They base64 encode the urls...but then they unencode it to actually get the page contents.
You could make your own page which acts like a link to the chat script or whatever. Just research fopen() and fread(). Oh, and make sure you send the right headers.
Although...I don't really see the point...since the this script might as well be the chat script itself, since all it's doing is relaying the file contents.