Running 2 World Editors at the same time?

I was wondering how you run 2 world editors at the same time to compare maps and easier copy pasting without having to close a map and reopen another one especially if they're big and take a long time to load.

it's impossible.

Instead of closing and opening a map everytime, just go to window and switch between two maps.

wow i thought that it would have to reload the map again if u switched

You have to reload it, but it just don't shows the loading.

well, atleast u dont have to save it every time.

and, you can run multiple world ediotrs. need a crack of some sort, which most likely dosent exist. so give up the dream now.