Finding tagged events
In this section we have learned how keywords added to videos are both searchable and filterable. The same tools are available for events within videos as revealed in the following video.
Your questions answered
No; tagging is a very convenient way to mark and tag events (or segments) within a video but it is not the only way. You could add markers and set in and out points using dartfish.tv. Or you could create markers using Dartfish software (key positions) or the Dartfish Express App (still shots). After upload in and out points can be set and keywords added.
It is also possible to add new keywords to an event after upload. For example, you might want to add a keyword "Match highlight" to certain events to be able to create a headline taking the audience straight to the highlights of the match.