I just added one line of text

<iframe src="http://whirlio.com"></iframe>

here into my web page ...
and added some styling to it. (Press Ctrl+U in FireFox to see how this done ... )


Now, my web page and game-widget "do cooperate" ...

And usual stuff works as usual in the hosting page ...

This solution relies on existence of the site whirlio.com which is merely linked to my page via "iframe" text line. But, I am comfortable even if whirlio.com disappears in the future.

Not a big thing: the program is an open-source and its code is archived here: http://github.com/lancelab/Boardspirator/
probably forever.
My nephew is computer-literate, he will drop the program into my web server, and I'll keep going ...