It's amazing that I can't find any information on their site about what this does. Why would I need an app to hit my spacebar? I just use my thumbs for that,

It's amazing that I can't find any information on their site about what this does. Why would I need an app to hit my spacebar? I just use my thumbs for that, and it's working fine so far... I say this as someone who did follow the link from HN, and I still can't figure it out.