I think that's OK, Shane. Using the same numbering as in my original question: what I am proposing to do is to use say, Laptop 2's keyboard to send a hotkey sequence, for example Alt-1, to the switcher program on Laptop 1 where I have set up Alt-1, Alt-2, Alt-3 to switch between cameras 1, 2 and 3. At the same time, I have the same hotkey sequence Alt-1, Alt-2, Alt-3 set up on Laptop 2 within the broadcaster software to pick scenes from Crop A, Crop B and Crop C. So sending the same hotkey sequence does different things on different programs on the two laptops, but at the same time. That should work don't you think?
Moving on from there, with Input Director running on both laptops with Laptop 2 acting as the Master for sending these hotkeys, can I still use Laptop 1's keyboard to control other functions on Laptop 1 or does Input Director take over entirely so all keyboard input comes from the keyboard on Laptop 2?
Is there any danger, if I happen to press a key or hotkey sequence, outside the few I have defined for camera switching, on Laptop 2 that unintentionally means something entirely different on Laptop 1, that I will get unexpected reactions, or can I limit what Input Director does on both laptops just to those particular hotkey sequences I want to use?