Applies only to broadcast circuits.  Indicates the amount of
 assistance to be provided during broadcast loopback testing by
 the assistant node, whose address is specified in the ASSISTANT
 PHYSICAL ADDRESS or node-id as specified in the ASSISTANT NODE
 parameter.  There are three possible values of help-type:

   TRANSMIT   The assistant node relays the request to the
              destination node, which replies directly to the
              executor node.

   RECEIVE    The executor node sends the request directly to the
              destination node, which relays the reply to the
              assistant node for transmission to the executor node.

   FULL       The assistant node relays the request and the reply
              between the executor node and the destination node.

 If HELP is specified, ASSISTANT PHYSICAL ADDRESS or ASSISTANT
 NODE must also be specified.