Sorry if this has been discussed but:
When you log into The World, what does it say about The World logo itself?
I tried squinting my eyes to see but, it's too hard ;.;
I thought it might've said Key of the Twilight but that's to the left on the sword.
Is it in German?
Then could the Twilight be the boundary between the World and the real world? The lyrics to 'The Key of the Twilight' song on the .hack/sign OST 1, seems to point that way.