Open a text editor, press and hold one key, then proceed holding a second key while still holding the first. Continue doing this with a fourth and a fifth key and maybe more... The result would be something like this: aaaaaassssssssssssssddddddddddddddddddddddddddd I can only press 3 keys simultaneously, so when I held the F key no f's appeared on the screen. That's how I did a quick test on how many keys I can press simultaneously, but I'm sure there are better / more official ways too... [Rolling Eyes]
