...have 2 or more windows open on the same
screen to eg. be able to read from one file and paste to another and
test in a 3rd...............
Oh, you mean like this?
File manager open... check!
Share between Multiple files.. check!
Compare and edit (copy and paste) between multiple text files.. check!
Execute any number of script files to test... check!
If you're already running, why would you force yourself to crawl?