Keyclick is a System Preference pane. It doesn’t affect your physical keyboard at all; it just makes noise when you type. So how can it be helpful, as claimed on the product’s Web site, “if your keyboard seems mushy, or you’ve ever longed for the crisp feel of an older keyboard”? Why does it make me a better typist on my MacBook? It’s because the noise it makes, though little more than a faintly detectable pop each time I press a key, tells me almost subliminally that I have pressed a key.