What’s the difference between the Presentation Code and password?
The Presentation Code connects the audience to the presentation. It is entered at http://attend.sl/. The presenter may choose a password to protect his presentation further. It has to be entered after the Presentation Code.
How long can I use the Presentation Code to join to a presentation?
The Presentation Code is only valid during a presentation and a few minutes after it has finished. If you still want to connect to a presentation later, you need to ask an attendee to share the URL of the presentation with you (by copying the URL in a browser).