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The keyword you need is OVERLAY....but....you may also need
CLRL(*no) if your second screen overlays any attribute byte on the original
screen.
I.E.
If you write a header format and then exfmt a SFL(SFLCTL)
screen you would only use OVERLAY.
If you wanted a screen in the middle of a previous full
display you would need both OVERLAY and CLRL(*NO).
I do not believe you need to use a dummy blank screen or the
ASSUME keyword to achieve this.
Hope this helps.
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