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Yes - the subfile image is kept in the program's memory. I've also done it using User Spaces for cases where a "reference" type subfile can be shared by multiple users.
The technique is explained here: https://www.itjungle.com/2008/10/08/fhg100808-story01/<https://www.itjungle.com/2008/10/08/fhg100808-story01/> I'm sure I've rewritten that in a more modern style but can't find the reference. That one uses a fixed array size but the technique with dynamic memory is the same.
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