After loading the applet looks like this:
Clicking on the 'initialise...' button opens the parameters window:
Clicking on the 'OK' button after setting the parameters initialises the program. This can take some time. The initialisation creates internal data tables that speed up the subsequent calculation of individual videofeedback iterations. Close the window entitled 'screen area seen by camera', which pops up once initialisation is completed. When initialised with the default parameters, the applet looks something like this:
Successive videofeedback iterations can be performed by clicking on the "do 1 iteration" button:
After a number of iterations, the pattern does not change with further iterations  the pattern has become stationary. Clicking on the image of the screen pops up a menu with options for displaying and saving the image. Clicking on the 'empty screen' button gives all pixels the same brightness, i.e. the applet is reset to the state after initialisation. Here are a few more interesting parameter sets:
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