In addition to the above I would assume that you could get the button to do other things such as run programs etc as all it's doing is sending text to the computer. I have had a re think also and have come to the conclusion that the 28 hex value could possibly be the same as clicking OK or...
I was given a SmartButton on Friday last week. When I opened up the case there was a small black blob which I assume is the Cypres device mentioned above. However next to this is located a 24C02 serial EEProm chip made by Atmel.
When I read this device (in circuit) using a suitable I2C...