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Tell screen how to deal with user interfaces (displays) that cease to
accept output. This can happen if a user presses ^S or a TCP/modem
connection gets cut but no hangup is received. If nonblock is
off (this is the default) screen waits until the display
restarts to accept the output. If nonblock is on, screen
waits until the timeout is reached (on is treated as 1s). If the
display still doesn’t receive characters, screen will consider
it “blocked” and stop sending characters to it. If at
some time it restarts to accept characters, screen will unblock
the display and redisplay the updated window contents.
Same as the nonblock command except that the default setting for
displays is changed. Initial setting is off.