Exposing SAP Systems using EP6 SP2?

I am interested in Exposing SAP Systems (using Webgui and/or Wingui)using EP6 to the outside world. All Java iViews connecting to SAP Systems seem to work if EP6 is exposed to the outside world. But exposing webgui/wingui thru the portal seem to require me to expose them indiviually thru the firewall.
Is this correct or does anyone know a way of exposing the webgui/wingui thru the portal without having to explicitly exposing each installation?

Maybe I am wrong, but I am afraid, that the webgui/wingui really must be exposed through the firewall to the outside world. It's because the portal doesn't produce the content of the iViews itself, it just merely passes according URL's of the webgui/wingui to the client's browser, which then communicates directly with the according (ITS) server.

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