This Boolean property affects how the Read and Write
methods read or write data to the socket. If set to a value of true,
urgent (out-of-band) data will be read or written. All reads or
writes of urgent data are unbuffered. The property value will
automatically be reset to a value of false after the socket has been
read or written.
Note: Not all implementations may support more than one
byte of urgent data if the data is not being received in-line. Refer
to the InLine property for additional information.