Infinite Worlds and Cabal, how does their travel actually work?

[Boyboy180]

Originally Posted by johndallman

These things are not clearly explained in GURPS rules. When I started running Infinite Cabal, I had to decide on them. My answers are too long for a posting, but you can find them in issues 1 and 2 of the fanzine The Path of Cunning, available free of charge from the link below.

These are great! They even answer other questions I was thinking of asking.
The one thing that I can't seem to find is rules for if their magic can be used on any world with mana.
Is there a general rule that you can use to figure it out?