It is a file manager for UNIX-like operating systems. It uses a simple and efficient interface pioneered by Norton Commander, in the 1980s. The main window is divided into three parts, described as "panes" or "panels". Two of those (side-by-side or top-to-bottom) show the contents of selected filesystem directories. The third pane, at the bottom of the window, shows the output of commands executed within the program. Those panes can be resized, and any one or two of them can be hidden and unhidden, on request. A built-in command-line, toolbar buttons or assigned keys can be used to initiate commands.