When a rule executes that has event figure(s) in the body, event(s)
are generated that simulate user generated mouse events. A drag event
figure simulates a mouse drag event. The click event figure simulates
a mouse click. However, the color of the event makes a difference.
Only events figures that are the same color as the rule simulate mouse
events. Event figures that are a different color insert the figure
into the document.
For example, in the Vispatch program below, all rules are black, so
the red drag event figures are inserted into the document. Black
event figures simulate new events, which in turn cause the rules
to be called recursively.
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