If I understand what you are trying to do, the preferred way to closely tie together multiple projects, and integrate working between them more seamlessly, is through the use of links between binder items. What you are describing otherwise is one of those things that… well you’d have to start all over from scratch to get there, in terms of programming. That’s the kind of thing you have to design for from day one, and have a really good reason to, when the alternative is as simple and safe to code for as having two project windows open.
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