I am using RH6. I placed my cursor in the middle of a
paragraph. I expected to insert text there (that is, I expected new
text to appear at my cursor while preserving existing text).
Instead, I was overtyping existing text (that is, as I typed,
existing text was overwritten by new text). I searched RH6 Help and
the Adobe site for "overtype" and "overstrike" but found nothing.