Free Vertex Viewer is easy to use everyman’s tool, which complements the design of software for operating chain. It is the ideal tool for change requests, comments and markings of drawings. Vertex Viewer can open for viewing and redlining drawings made with Vertex as well as DXF and DWG files. Vertex Viewer can add text, lines and symbols to drawings. User writes text either directly in the drawing or in the yellow note pads hiding longer texts. Texts on the pads can be found easily by clicking the pads. The entries can be emphasized by color fill. User can also insert a standard symbols into drawings from Symbol Library. Markings can be hidden and unhidden from the the drawing if necessary.