On 28/08/2011 07:31, Nicholas Marriott wrote:
> What does it do?

It disables flow control to the current display. From the manpage:-

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.


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