code: function removeReferral(client) {
      if (! client) return;
  
      client.unbind();
      var indexOf = pendingReferrals.indexOf(client);
      if (indexOf >= 0) {
        pendingReferrals.splice(indexOf, 1);
      }
    }
docs: Call to remove the specified referral client.
  @param {Object} client The referral client to remove.