16. In combination, An an article of manufacture for obtaining automatic actions through a network, and the system of claim 15 , the article of manufacture comprising: print medium; visually recognizable machine-readable markings on the print medium; and visually unobtrusive machine readable markings localized in regions of the print medium which are indistinguishable from other regions by the visually recognizable machine-readable markings alone, the visually unobtrusive machine readable markings being absent from at least some regions which are distinguishable by the visually recognizable machine-readable markings alone, the visually recognizable markings combining with the visually unobtrusive markings to render regions that are associated with an automatic action distinguishable from other regions that are associated with a respective automatic action, whereby the processing component associates a region of the article observed by the optical input device with a location identifier, the action device providing the action automatically in response to the location identifier.
16. In combination, An an article of manufacture for obtaining automatic actions through a network, and the system of claim 15 , the article of manufacture comprising: print medium; visually recognizable machine-readable markings on the print medium; and visually unobtrusive machine readable markings localized in regions of the print medium which are indistinguishable from other regions by the visually recognizable machine-readable markings alone, the visually unobtrusive machine readable markings being absent from at least some regions which are distinguishable by the visually recognizable machine-readable markings alone, the visually recognizable markings combining with the visually unobtrusive markings to render regions that are associated with an automatic action distinguishable from other regions that are associated with a respective automatic action, whereby the processing component associates a region of the article observed by the optical input device with a location identifier, the action device providing the action automatically in response to the location identifier. 18. The combination of claim 16 , further comprising a machine readable global identifier which identifies the article.