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    Date: Friday, 3 August 1984, 20:54-EDT
    From:  <TIM at MIT-MC>

    In ZWEI in Release 5.1, Experimental MIT 1.4, FEP 18, on Lisp Machine Sancho Panza (3600):

    Any reason why  (Backspace) is a self-inserting character in ZWEI?

Since the lisp machine can overstrike, backspace self-inserts.  Since
the effect of accidental overstriking can be confusing (imagine getting
undefined function errors for DEFUUN), it is made visible until
you do m-X Set Backspace.