p2pool merged mining
You actually don't use the addresses, but the RPC info for the daemons. For example you'd start the pool with the following switches:

python run_p2pool.py --net vertcoin3 --merged http://*RPCuser1*:*LongRPCpass1*@127.0.0.1:6888 --merged http://*RPCuser2*:*LongRPCpass*2@127.0.0.1:7817


You will see "Got new merged mining work!" in console as confirmation.