It can display maximum of 20 file in piles or in arranges. Display mode is overwrite, merge, undisplay, mirror at a file. By this, two or more files are seen in piles, or you can check the difference between the drawing by different colors. Output is to PDF, HPGL, EMF, TIFF, DXF, DWG, JPEG, Bitmap, IGES, Printer, Plotter. It has same powerful input and edit function as 2D-CAD, it can read view file and edit.