Can I send the same link to each participant within the same Round, or do I need to generate different links for each participant?
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Yes, you will send the same link to all participants that are carrying out a specific type of test (within the same Round). You can generate the link by creating a Round within a Project. 

For remote moderated you'll create a LiveShare Round and click the Participant Link button and then copy the LiveShare link:

For In-Person moderated you'll create a LiveShare Round and click the Start In-Person button:

For remote unmoderated you will create a SelfTest or Tasks Round and click the Participant Link button and then copy the link for your participant:

A unique interview room is created for each participant who clicks on the link, so you never have to worry about one participant interfering with a different session. The result will be multiple separate sessions (recordings) within a Round that originated from the same participant link. They will automatically sort by session date, like so: