http://www.dakkadakka.com/dakkaforum/posts/list/31.page JForum - http://www.jforum.net
The Watched says that it leads "everywhere", so I'm assuming that means that it can eject the Necrons anywhere the Webway will take them, but not necessarily with a way back, which seems strange. An alternative theory as that there are many Dolmen Gates, and one can enter into any one of them and emerge from any other, but that doesn't quite fit the text as written so far.

Are there any other scraps of information I could find about them? Anything I've missed or forgotten?]]> http://www.dakkadakka.com/dakkaforum/posts/preList/683571/8519141.page http://www.dakkadakka.com/dakkaforum/posts/preList/683571/8519141.page GMT
IIRC a Tomb Ship actually carriers its own Dolmen gate, which would solve some issues.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/683571/8519508.page http://www.dakkadakka.com/dakkaforum/posts/preList/683571/8519508.page GMT