Automatic actions can be obtained through a network using an area of marking medium with machine-readable markings that encode an action/medium identifier. The action/medium identifier identifies an action that can be produced through the network, and also identifies the area of marking medium. For example,...http://www.google.ca/patents/US6330976?utm_source=gb-gplus-sharePatent US6330976 - Marking medium area with encoded identifier for producing action through network
