If a user attempts to receive from another user that is also receiving, an exception will be raised.

[Benji York]

This is the exception:

Traceback (most recent call last):
  File "/usr/bin/tb", line 25, in <module>
    pump.loop()
  File "/usr/lib/pymodules/python2.7/termbeamer/pump.py", line 46, in loop
    self.loop_body()
  File "/usr/lib/pymodules/python2.7/termbeamer/pump.py", line 57, in loop_body
    super(GtkPump, self).loop_body(now=now)
  File "/usr/lib/pymodules/python2.7/termbeamer/pump.py", line 41, in loop_body
    self.handle_messages()
  File "/usr/lib/pymodules/python2.7/termbeamer/pump.py", line 26, in handle_messages
    self.pumpee.handle(message)
  File "/usr/lib/pymodules/python2.7/termbeamer/client.py", line 76, in handle
    raise ValueError('unknown message type: %r' % message['type'])
ValueError: unknown message type: u'refresh'