[Oberon] ETHO Display structure.

[Jörg]

Hi Chris

> Once I can fetch the char at the mouse-cursor/pointer I'll use it.

Fetching characters from the "caret" position, from the "cursor" position or
from the "keyboard" are different things. Reading the book "The Oberon
system" by Martin Reiser might help.

br
Jörg

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