[Oberon] PO2013 - System.CloseTrack / System.ExtendDisplay

[eas lab]

> A neat feature.. but rarely used (I suspect?), as the average user
>doesn’t necessarily think in stacked 3-dimensional window layouts.
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If I remember correctly it's NOT accessible as 3-dimensions like my
paper-book: page, line, column.
Or if you imagine a: page, line, column; configuration, where the frames
take up the whole track, could you write an ET <script> for DisplayPage(N)=
 Down :=Present -N
 REPEAT
  <move marker to Present> ; <move Present to other track>
 N:=N-1
 UNTIL Down = 0