1. A system for copying interactive documents, the system comprising: a copier for scanning a surface of a document, the document being printed with document content and a plurality of coded tags, each tag encoding an identity of the document and the position of that tag on the document, the copier incorporating a sensor for sensing the coded tags; a computer system networked with the copier for identifying a digital version of the document from the document identity of a sensed tag and determining user input on the scanned document using the tag position of the sensed tag, the user input requesting copy content and/or coded data from the computer system; and a printer networked with the computer system for printing a copy of the scanned document incorporating said scanned document content and coded tags and the requested copy content and/or coded data.