Here are some example persistent URLs you can use in the lab. They will stay constant for new sessions, even if the database is recreated.
You should take these links, copy them for as many participants are in your session,
and modify the
participant_label parameter of each link.
The above is just an example.
You can use whatever naming scheme you would like to use, e.g.
The default session is currently not set.
Before launching your experiment set the default session
via the sessions page
the participants to it.