How do you interactively write to a CEditView Window

(Newbie): I am trying to output status and diagnostic information to a
CEditView Window and allow users input annotations to the same window. The
User input is handled by Windows. How do I output to the window? How do I
ensure that program output is appended to existing text? DrawText erases the
screen and outputs to (0,0). What is the magic? (Please)

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