66. A computer system for producing a digital form of a digital document, wherein the document can be one of several different types and with varying content, the system comprising: means for sending a request for at least part of a document; means for accessing a definition of additional content for a type of the document; means for generating an additional content component according to the definition of additional content for the type of the document; means for receiving a selected portion of the content of the document, the portion having been selected in accordance with the request; means for combining the additional content component with the content of the portion of the document to obtain the digital form of the document.
72. The computer system of claim 66, wherein the means for combining includes means for transforming the selected portion of the document according to an identity of a computer which sent the request.