The base SDK for the G19 is the same as for the G15. The two keyboards are exposed using the same API and a program made for one doesn't have a lot of extra work to get it working on the other. As long as you take into account the differences of the LCDs and buttons.
I'm actually implementing G19 support for ACT now. While you can use Microsoft's Sideshow whatever to interact with Logitech's software, I think it'd just be easier to generate the bitmap frames myself and pass the byte array to the API than it would be to figure out how Sideshow works. (I've really no idea)
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