The following is a screenshot of the current graphical user interface, designed with Glade-2. Red squares are buses, black lines are branches, and green lines are switches. Source buses on top of the trees are indicated by "transformer" symbols (indicating these are connections to the transmission network). Boxed buses, usually at the leav c are "consumer" nodes.

All switches are mouse-sensitive, so that you can change their state by clicking on them and see the new state of the network. The computed bus voltages (branch intensities) can be seen by placing the mouse on a bus (branch) and watching the status bar message at the bottom of the window. Blackout areas (caused by the opening of some switches) are indicated as grey "halos" around the affected subnetwork.