TRIO uses WebNode internally to execute method calls after they have been marshaled by Converter. That is, when the TRIO object has been typecast to an invokable interface, it implements each method call by using Converter to marshal the call into an encoding protocol, and then uses WebNode to execute the encoded call. 

Each TRIO descendant uses its own protocol-specific helper object as the value of the WebNode property. 

Converter 

THTTPReqResp 

OnAfterExecute 

OnBeforeExecute