Quote:
Originally Posted by David Johnston2
If you look at the fiction, it is extremely rare for the portal to be one-way. By default it would be two way.
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I'll go right ahead and quote Stargate to you and say "Why would you assume matter can travel both ways ?" :D
But yes, generally portals are seen as two ways, and there is often no tunnel, you just step through the gate and on the other side you're somewhere else. Often you can look through, sometimes you can't.
So I guess it's again a GM's job to decide what's the default for the setting and how much are the different options.
Might also be worth considering what happens when you're halfway through and the portal closes.