Questbook

The questbook is added by the optional client mod.

It shows viewer quests sent by the server when quests use Display Mode: Client Overlay.

Tabs

Active: quests currently running.
Completed: quests that finished.
Abandoned: quests that were cancelled or abandoned.

What a quest shows

quest name
viewer name
objective type
current progress
eligible items, blocks, or mobs when relevant
reward information when visible

Tracking

The questbook can track an active quest so the overlay knows what to show.