"Hold down both shift keys, and start typing all the keys on your keyboard. If every key press shows up, there's no need to buy a new keyboard... however, if it looks like this:
ETYUIOP{}| (that was the QWERTY row on this POS work keyboard)
...then your keyboard is ghosting, which means it can't pick up more than 1 or 2 key presses in a particular moment. If this happens to you, it means that fast action (especially with TF2 rocket jumping, quick switches while moving, etc.) will not get input correctly, and your play will suffer."
