Library /sys$common/syshlp/helplib.hlb  —  Sys Parameters, TTY_SPEED
    TTY_SPEED sets the systemwide default speed for terminals. Low
    byte is transmit speed, and high byte is receive speed. If high
    byte is set to 0, receive speed is identical to transmit speed.
    Maximum value is 20. Baud rates are defined by the $TTDEF macro.
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