1. A document management and viewing system, comprising: a user interface for providing data representing a single composite display window concurrently displaying pages of different first and second documents as a plurality of non-overlaid reduced size images of individual pages of the first document and a plurality of non-overlaid reduced size images of individual pages of the different second document and, including at least one document break element identifying a transition between pages of said first and second documents and providing a visual cue distinguishing pages grouped into single documents, enabling a user to select and move a page from said first document to a desired location within said second document visually separated from said first document by said document break element and updating stored data representing said first and second documents in response to a command entered using said single composite display window, said single composite display window enabling a user to expand and increase size of a user selected individual reduced size image of an individual page.