If you navigate to a url with a hash param or query param of cobrowse_pin=<valid pin number> a session will automatically start.
Alternatively, if you append #startcb to a url it will automatically trigger opening the cobrowse pin entry modal.
Example
https://www.example.com/?cobrowse_pin=123456
https://www.example.com/#cobrowse_pin=123456
https://www.example.com/#startcb