For people, who need to let her ( him ) know without words, bcs it´s too loud in the disco or club. Send SMS - the recipient doesn´t need Palm or mobile phone to receive it! But it´s also universally usable in many serious situations, where you can see the recipient, but you cannot hear each other, so you can send him small message. From one car to another, from bus to your friend on the street, in the production and many other locations, where the distance is not more then 20 m.
Updated Description:

customize the list with your own messages