The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From FiveTaps Ltd:
Are you in a hurry walking down the street but you need to write an email, sms or update your social status? You have found the perfect tool for this and many other situations!Type @ Walk lets you type while you are walking and then it give you the options to send it to sms, email, twitter, facebook or copy it to your clipboard.