I think you are reading some old documentation. Unfortunately the docs are not updated as often as they should be. In any case, prior to version 1.50, the sequencer was implemented in JavaScript, and so the sequencer engine ran inside the browser. This created many limitations, for example, if the browser disconnected for any reason, the sequence would stop running. Also, only one person could control and watch a session while it was running.
So the BIG update in version 1.50 (I call it that since it took more than a year to create and debug) was to delete the JavaScript sequencer and substitute a completely rewritten version that runs inside the 416 itself. You will find a link to the new sequencer on the Centipede’s index page.
The current sequencer guide was written by one of our customers, and while an excellent document, it needs updating. It was written based on the JavaScript version of the sequencer.
Robert