There's no demo that I know of any HPS game. You can download the documentation updates from their website and extract it anywhere to read the manual.
Chain of command comparable to Airborne Assault, definitely not (No game that I know has that besides, of course, the Airborne Assault games). You can issue formations an axis of advance and order the AI to take care of moving those formations, as well as firing and assaulting, but I can't comment on how well it does with it at the moment.
And it will work on Windows 7 just fine if you patch it.
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