In normal operation, your default "channel" -- Chumby's terminology for a particular set of selected widgets -- cycles on an endless loop, and if you'd like to add widgets or channels, you log into Chumby's site to do so (though you can delete widgets and freeze the display right from the device itself if you need to).
The rest present them as a voluntary secondary security option in lieu of a pat-down, which is protocol for those who've repeatedly set off the metal detector or have been randomly selectedfor additional screening.
After downloading software from its Web site and activating the chip, it can be used to set up passwords for individual files as well as to encrypt selected files.