regarding Lightroom license, where when you buy it, they give you both mac and pc versions of LR.
based on this thread where Victoria answered definitively that you may install it on a MAC and PC with SAME license...
so if you actually accidentally were actively using LR in PC and you forgot to "close" the app on your macboo then your wife starts tinkering with LR on the macbook... what happens eventually? license gets rejected if it ever probes apple??