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    Henry@MIT-AI 08/16/79 15:40:15
    To: (BUG LISPM) at MIT-AI
    The code for TYI checks to see if the stream has a 
    rubout-handler to decide whether or not to echo the character.
    I presume this is to avoid echoing the character when TYI'ing 
    from a file. This screws streams which don't have a rubout handler
    but want TYI to echo. Perhaps there should be some way to ask a 
    stream whether or not it is talking to a terminal. This would be 
    useful in user programs which want to make some sort of distinction 
    like this as well.

Having a RUBOUT-HANDLER capability is supposed to be equivalent to 
being interactive.