How does one go about retrieving the Requestor's IP/Host address when in the TRtcFunction.OnExecute event?

In the OnExecute event, you also get the "Sender:TRtcConnection" parameter,
which you can typecast to TRtcHttpServer(Sender) on the Server.

To check Client's IP address, use:
  Sender.PeerAddr

To check Request properties, use:
  TRtcDataServer(Sender).Request

Best Regards,
Danijel Tkalcec