I loved this article! He did learn the wrong lesson regarding the failed demo where he couldn't launch his CD because he only knew Macs and Unix. It is important to know how to use Windows, that's true. But even more important is: be absolutely certain you control every variable you can in a demo or presentation. Count on as little as possible from the audience/venue. Every salesman knows this, right? You bring your own laptop.
I remember my course at a TV and Radio Repair training shop. They emphasize a lot that you need to learn and memorize where all the screws go on popular models.If your client sees you trying to figure out where the screws are, they won't trust you no matter how good you are with the electronics inside.
