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made something similar 14 years ago...

domain isn't mine anymore...

Oh wow, from December 2008.

Here's to no one trying to patent it now!

What API allowed that back then?

It was an API I developed using ActiveX on Microsoft's Internet explorer and NPAPI on other browsers

I don't see what is technically new about this? What API has been missing to do this?

Tcp and window.screenTop and screenLeft should get you there right? Hmm, yeah, 2008 is a long time ago though..