Pen and paper provide an easy interface that is unsurpassed except for long text passages. However, pen and paper are not well supported by current technology. This is due to difficulties recording pen and paper without affecting its natural feel, and insufficient handwriting recognition rates. Recent advances in pen-based hardware and improving recognition rates are helping to better integrate pen and paper into daily workflows. The document proposes a "Callpaper" concept where each paper document would have a corresponding model file accessed via the Internet. This model file would provide context and instructions for processing recognized handwritten input.