9. A method according claim 1 in which said physical paper identifier has a device position determining pattern on it to enable said device, to acquire data to enable said position of said pen, or device, on said paper to be determined, and to enable device movements on said paper to be represented in an equivalent digital document.
9. A method according claim 1 in which said physical paper identifier has a device position determining pattern on it to enable said device, to acquire data to enable said position of said pen, or device, on said paper to be determined, and to enable device movements on said paper to be represented in an equivalent digital document. 10. A method according to claim 9 wherein a link is caused to be established between said first electronic document and said second electronic document by one of: (i) making one of a specific predetermined action, gesture and mark with said device on at least one of said first physical paper identifier and a second physical paper identifier which has a device-readable code coding for said second electronic document; (ii) making one of a non-specific undefined action, gesture and mark with said device on at least one of said first physical paper identifier and a second physical paper identifier which has a pen-readable, device-readable code coding for said first or second electronic document; and (iii) making a non-specified mark with said device by one of (a) placing device in contact with said first physical paper identifier and moving said device from said first physical paper identifier to a second physical paper identifier which has a device-readable code coding for said second electronic document, and (b) placing said pen or device in contact with said second physical paper identifier and moving said device from said second physical paper identifier to said first physical paper identifier, wherein device exerts downwards pressure, throughout said pen stroke or device movement producing said mark.