A method, apparatus, and system provides an integrated viewer with one user interface and one API provides the ability to view, program, redline, and measure DWF and DWG files. In accordance with one or more such embodiments, the present invention provides an intelligent drawing redlining tool for easily...http://www.google.de/patents/US6628285?utm_source=gb-gplus-sharePatent US6628285 - Intelligent drawing redlining and commenting feature
