There are many scenarios where the combination of visual tags and camera phones can be employed. Maybe you're walking down a city street and see a poster for a movie or a play. On the poster is a visual tag. By using a camera phone, you could click on the visual tag to get more information on the film. Additionally, there may be an option to buy your tickets right then and there.

[...]

Visual tags encode information in two parts: a service identifier and a data block. The service identifier encodes the name of the Bluetooth service to which a tag relates. The data block contains a few bits of application-specific information that are used to identify a particular tag.