This is done via the in-game Online Features menu. Participating players are able to construct a station module that sends ships into the game worlds of other participating players, and of course 'welcome' them into theirs as they see fit. In this case the 'beta' tag refers to how the Ventures operate online behind the scenes - it isn't a risk to save games in the way that participating in a beta for game updates might be. Please note that this new feature is considered to be in Beta at this time with plans for future iterations. The Venture Feature is an optional Online Feature linked to your Egosoft community forum account.
Update 1.50 to X4: Foundations introduces the Venture Feature. What Happens When The Game Is Modified?.
