37. An article comprising a machine-readable medium storing instructions operable to cause a physical-document monitoring device comprising one or more machines to perform operations comprising: determining whether a state of a document has been sensed with a sensor coupled to a document coupling device; determining the document state with a computer coupled to the sensor and the document coupling device; and generating a wireless message to send a representation of the document state to a remote device.
37. An article comprising a machine-readable medium storing instructions operable to cause a physical-document monitoring device comprising one or more machines to perform operations comprising: determining whether a state of a document has been sensed with a sensor coupled to a document coupling device; determining the document state with a computer coupled to the sensor and the document coupling device; and generating a wireless message to send a representation of the document state to a remote device. 38. The article of claim 37 , wherein the document state comprises the number of document pages.