CmdDelimiter is a Char property that identifies the delimiter character used to separate Command from any parameter values in data received from a peer connection. CmdDelimiter is used in Check when parameter values are detected in the received data. If CmdDelimiter contains any value other than CHAR0 (Decimal 0), both Command and CmdDelimiter are extracted from the received data. Any remaining data is used as parameter values for the associated TIdCommand object instance. 

The default value for CmdDelimiter is ' ' (Decimal 32), as assigned in Create.

Check 

Command 

TIdCommand