screen: XON/XOFF

 
 15.3 XON and XOFF
 =================
 
  -- Command: xon
      ('C-a q', 'C-a C-q')
      Send a ^Q (ASCII XON) to the program in the current window.
      Redundant if flow control is set to 'off' or 'auto'.
 
  -- Command: xoff
      ('C-a s', 'C-a C-s')
      Send a ^S (ASCII XOFF) to the program in the current window.