You have now finished specifying the example interface and its callback functions, so you can test it.
defsys.lispif you have not already done so.
Next, you need to load the
system into the environment.
defsys.lispis visible, and choose File > Load to load it and define the system.
system, together with its members, is loaded.
A fully functional instance of the example interface is created for you to experiment with.