The server of PDS can be launched using the panel server from the GUI of PDS Simulator. So you can specify the port on which the PDS Simulator can listen.
You can use the GUI of PDS Simulator to delete some or all patients. You can manually add some patients, and you can generate patients using the IHE tool: Demographic Data Server. The GUI of PDS Simulator uses this tool to generate patient from some countries: Fr, USA, Germany, etc. You can then add these patients to the database.
PDC Simulator has a wsdl which lets you to communicate with this tool. The wsdl is here. The web service of PDS Simulator contains all methods needed to communicate between gazelle and this simulator. These methods let gazelle to start communication with the PDS Simulator and to send configuration of the SUT Consumer.