Unfortunately it doesn't have a browser, so your puter can't even load up puter.
It's pretty cool, but I can't think of what this would be useful for. Presumably, you need a sophisticated desktop OS that can run a modern web browser in order to use this. And that OS is likely more useful than this.
Yep, you can, I now have several nested Puters.
I did this months ago! Here it is: https://puter.com/app/puter