These URLs will stay constant for new sessions, even if the database is recreated.
Here is the room-wide URL anyone can use. Don't use this link when testing in multiple tabs on the same browser, because all tabs will be assigned to the same participant, using a cookie.
http://presto-test-server.andrew.cmu.edu/room/secagg_demo
Generally, you should provide your participants with the room-wide URL above. But in special cases where you need to open (or re-open) a specific participant's link, by using the participant code, you can use the below links.