Widget intputs to the C# code how?

[kevin1]

Looking at examples, I haven't pinpointed the trace from clicking on on button on the widget, to the C# code.  Does it use the

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When.WebServiceCallReceived("HomeAutomation.BsmtUtil", ( args ) =>
I know the WebServiceCallReceived can be executed via browser URL, but is it the widget to code interface as well?

Or this:

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When.ModuleParameterChanged( (module, property) => {

Trying to control an RGB LED on my Arduino as status indicator :-)

Thanks!