Most computer users interact with their workstations primarily through some form of graphical user interface (GUI). In the world of Microsoft Windows, this interface is tightly controlled. The UNIX world, by contrast, offers a veritable smorgasbord of different GUIs with varying degrees of functionality. They range from minimalist window managers, such as twm, to large, capable tools, such as GNOME and KDE (K Desktop Environment). This article shows you how the Tcl/Tk scripting language offers a simple and elegant way to code GUI widgets with minimal effort.