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In page Talk (software):

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Similar facilities existed on earlier system such as Multics, CTSS, PLATO, and NLS.[1] Early versions of talk did not separate text from each user. Thus, if each user were to type simultaneously, characters from each user were intermingled. Since slow teleprinter keyboards were used at the time (11 characters per second maximum[citation needed]), users often could not wait for each other to finish. It was common etiquette for a long typing user to stop when intermingling occurred to see the listener's interrupting response. This is much the same as interrupting a long monologue when speaking in person. More modern versions use curses to break the terminal into multiple zones for each user, thus avoiding intermingling text.