How to make RD Gateway visible from the outside

I read online that with RD Gateway, I can make my RDSH server visible from the outside without having to forward ports at the router. If so, how is this achieved?

I finished configuring the RD Gateway server and was able to <a href="#" id="_GPLITA_1" in_rurl="http://i.trkjmp.com/click?v=VVM6MzA5OTg6NDpjb25uZWN0IHRvOmQ2MWI0NGUwNjUwZjM5ZjdlMWFkMTJmZWQzOGM2ZTkzOnotMTMyMi0xMjc1MDQ6c29jaWFsLnRlY2huZXQubWljcm9zb2Z0LmNvbTowOjA" style="text-decoration:underline;" title="Click to Continue > by Coupon Companion Plugin">connect to the RDSH server through it, but only from inside our network. I had used the following guide to help me configure this:

http://technet.microsoft.com/en-us/library/dd983941(v=ws.10).aspx

any ideas?

thanks

-Frank