But a windowed subfile can be as small as it needs to be, and you can even do clever things like allow the user to move it around the screen, and you can call a window subfile program from itself (via an intermediate program) if it is written in ILE and starts in a new activation group - I use that in my help text system.
As for how to create windowed subfiles, search a site the Search400.com site or even Google. There are plenty of articles, how-tos and source code out there. The IBM DDS manual gives comprehensive instructions, and is always worth a read.
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