Author(s): Christoph Langner Following in the footsteps of Norton Commander and its clones, the Sunflower twin-panel file manager takes a giant leap forward with a switch to Python 3 and GTK3. Some programs, such as Netscape, Adobe Photoshop, and Microsoft Office, set the benchmark for future products. For file managers, the discontinued Norton Commander paved the way to easier copying, moving, and editing files at the MS-DOS command line. Norton Commander's view, which was divided into two halves (hence the umbrella term "twin-pane file manager") let users select files from a directory list in one pane by pressing Insert and then transfer them to the directory opened in the other pane by pressing F8.