You can either use the session-wide link, persistent links, or single-use links.

Session-wide link

During testing, you can open this link in up to 1 tabs.

https://more-demos.demo.otreehub.com/join/hagorera

Persistent links

For a real session, you should use a room.

Single-use links

Below are single-use links, which you can distribute to your participants. Each link has a unique code for the participant.

P1	https://more-demos.demo.otreehub.com/InitializeParticipant/663xx50m