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That is exactly what I do not want to do. I want to keep each campaign I am running self contained and clean. i do not want to have a bunch of space on my smaller laptop screen taken up by things I do not need for the game I am playing. I want to be able to close and open different campaigns. What you are describing just sounds cludgy and clumsy.
On a technical level loading the 1 big database with all my campaigns is going to be slower and more memory intensive than keeping them all smaller.
I think NBOS could easily add high-level tabs into the UI without taking up any screen space that would eliminate this need from a technical level as Ed describes...guess I have a different take...but I get your point.
What I was thinking for the next version was allowing people to 'zoom in' to a particular topic so that it looks like the root topic. This way they hide other topics from view.