Create is the constructor for the TIdTelnetReadThread instance, and relies on the inherited Create constructor to initialize the thread. TIdTelnetReadThread stores a reference to the TIdTelnet client that is the recipient of data read by the thread. 

TIdTelnetReadThread sets the FreeOnTerminate property to True, to indicate that the thread should be freed when execution has been completed. 

You should not need to create an instance of this object directly. Instances of this object are created when the TIdTelnet client connects to the host.