[Oberon] Text Viewer vs. Doc Viewer and etc.

[peter at easthope.ca]

Hi again, 

Oberon.MarkedViewer() returns the marked viewer. It can be a Text 
viewer in a track or a Document viewer in a track.  I can open and 
fill either kind of viewer but want output viewer to match input. How 
are these cases discriminated in code?  

Thanks,                           ... Lyall E. 
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