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Clearing the screen and other such things.

    Date: Sat, 27 Jul 85 05:11:22 EDT
    From: Tim McNerney <TIM@MIT-MC.ARPA>



    Many terminals don't support these operations.  If we are trying to limit
    ourselves to a set of essential primitives, I would suggest that these be
    flushed, since they are merely abstractions for printing the sequences,
    backspace-space-backspace and space-backspace, respectively.

	    Tim McNerney


This remark raises the question of whether the terminal has overstrike
capabilities or not; and if it does not, whether space is transparent
or replacing.