After this function is chosen you can draw arcs between any two existing nodes -- be they nodes just created with or nodes that are already part of a SNePS network -- by clicking right down over the source node, dragging the mouse (without releasing the button) to the destination node, and releasing. An arc will then appear between the two nodes. You'll notice that the arc has a ``break'' in the middle of it. This is a label that may be edited as you like.
This function may also be invoked by simultaneously pressing middle down and Control over the source node, dragging the mouse cursor to the destination node, and releasing.