public void CreateUser(string userName, bool propagate)
{
PeerGroupID gid = this.netPeerGroup.PeerGroupID;
PipeID pipeid = IDFactory.NewPipeID(gid);
PipeAdvertisement adv = new PipeAdvertisement();
adv.SetPipeID(pipeid);
adv.Type = (propagate ? "JxtaPropagate" : "JxtaUnicast");
adv.Name = "JxtaTalkUserName." + userName;
adv.Desc = "created by JXTA .NET";
discovery.Publish(adv);
}