BBC BASIC for Windows
« Open two windows in BBC interface? »
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are you just suggesting that you make no changes to all but one?
That's right - it's why I said 'treat' all but one of the instances as read-only: it's a user discipline rather than something enforced technically.
If you do (deliberately or accidentally) make changes to two or more instances of the same program, BB4W will warn you if you try to save the 'older' version, i.e. the one which doesn't have the most recent changes.
If the reason you have two (or more) instances open is to copy code from one program to another, you could always make the file that you don't want to modify read-only. That won't stop you making changes to it in the editing pane, but you won't be able to save them.