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In several contexts, IDLE binds clicking of the right mouse button to context popup menus, most importantly, to provide the Set Breakpoint and Clear Breakpoint actions in edit windows. On OS X systems, however, one cannot assume there will be more than one (e.g. the left) mouse button. Further, Aqua Tk, the default on OS X, binds a right button if present to <Button-2>, rather than <Button-3> as with other Tk implementations and ignores <Button-3> bindings. The net effect is that there is currently no way to use IDLE's breakpoint facility with Aqua Tk, with or without a multi-button mouse.