When this property is set to false, CTRL+S executes the hold screen keyboard function, and CTRL+Q cancels the hold screen. (Neither keystroke transmits anything to the host.)
where expression is a variable that represents a Screen Object
Remarks
When TransmitXonXoff is set to true, the hold screen function is not invoked. This property is automatically set to true when TerminalType is set to ANSIBBS or ANSIUNIX. It is automatically set to false when the value of TerminalType is changed from ANSIBBS or ANSIUNIX to any other value.