PloCon outputs continuously the plural plotter picture files of HPGL, HPGL/2, HP RTL, TIFF, JPEG, Bitmap, PCX, FPX, and PNG image file to the Windows printer. Output mode is selected from automatic, continuation and step mode. With option parameter of PloCon triggering, output becomes possible automatically from other applications, because it can be designated output mode, output file with the wild card, and output list file.