James Robison-Cox Putting RGtk to Work ******************** The RGtk package built by Duncan Temple Lang provides one way to build statistical applications in R which can be controlled by the user through a graphical user interface. RGtk is an interface to the GTK+ library of the GNU Project. In this paper an example GUI is built to illustrate usage of the RGtk package. The basic concepts of widgets and callbacks are demonstrated so that those familiar with programming in R will be able to build graphical applications.