22. A system for presenting to a user a visual representation of a combined document including at least some user readable content from a first paper document and at least some user readable content from a second paper document, said system comprising: a digital document linking device, said device having a position determining device adapted to acquire information to enable said position of said device to be determined, said position determining device being one of a position determining sensor and a camera; a first paper sheet having a first device-readable pattern to enable said device to acquire information from said first paper sheet to enable said position of said device in said first pattern to be determined; a second paper sheet comprising a paper document having a second device readable pattern to enable said device to acquire information from said second paper sheet to enable said position of said device in said second pattern to be determined, and there being an electronic equivalent document equivalent to said content of said second paper sheet; a computer processor adapted to process signals from said device; a communications link adapted to communicate said pen or device with said processor to enable said signals to be communicated to said processor, said signals including device acquired data capable of enabling said position of said device in said patterns to be identified; and wherein: said processor has software which when run is adapted to: identify said second electronic document equivalent to said content of said second document using second pattern-related data acquired by said device: to create a first electronic document representative of user-applied device movements, made on said first paper sheet when said user creates a first, written paper document on said first paper sheet; to interpret data derived from device movements performed by said user on said first and second paper sheets as linking instructions to create a link between said second electronic document and said first electronic document so as to enable a visual representation to be produced of said second paper document with said device created first paper document associated with it; and to act on said linking instructions so as to cause said first and second electronic documents to be so linked.
22. A system for presenting to a user a visual representation of a combined document including at least some user readable content from a first paper document and at least some user readable content from a second paper document, said system comprising: a digital document linking device, said device having a position determining device adapted to acquire information to enable said position of said device to be determined, said position determining device being one of a position determining sensor and a camera; a first paper sheet having a first device-readable pattern to enable said device to acquire information from said first paper sheet to enable said position of said device in said first pattern to be determined; a second paper sheet comprising a paper document having a second device readable pattern to enable said device to acquire information from said second paper sheet to enable said position of said device in said second pattern to be determined, and there being an electronic equivalent document equivalent to said content of said second paper sheet; a computer processor adapted to process signals from said device; a communications link adapted to communicate said pen or device with said processor to enable said signals to be communicated to said processor, said signals including device acquired data capable of enabling said position of said device in said patterns to be identified; and wherein: said processor has software which when run is adapted to: identify said second electronic document equivalent to said content of said second document using second pattern-related data acquired by said device: to create a first electronic document representative of user-applied device movements, made on said first paper sheet when said user creates a first, written paper document on said first paper sheet; to interpret data derived from device movements performed by said user on said first and second paper sheets as linking instructions to create a link between said second electronic document and said first electronic document so as to enable a visual representation to be produced of said second paper document with said device created first paper document associated with it; and to act on said linking instructions so as to cause said first and second electronic documents to be so linked. 25. A system according to claim 22 wherein said software is adapted to cause a third electronic document to be produced and stored in processor-accessible memory, said third electronic document comprising data obtained from said first and second electronic documents.