It depends on the customer configuration done in ConfigPortal, which metadata fields are shown for an event. Depending on this configuration an index number, the original timecode or a thumbnail for each event are displayed. Per default an event consists of following parts:
Will open the edit mode of the selected event
Will delete the selected event (after a confirmation dialog was accepted).
Will show all metadata fields of the event
Will collapse the selected event and shows it in condensed view
The symbol is shown when being in edit mode. By pressing the button, all changes will be commited and saved.