3dsmax from 2018 to 2022
This product is available as Node Locked or Float License.
You don't need a license to open scenes with bookmarks, but you need a license to visualise or edit them.
Bookmarks is a tool to help animators to stay organized.
It is inspired from the bookmarks tool in Maya.
You can quickly create visual bookmarks on scene or individual objects,
change their color, range, name, commment, link a camera...etc
Then you can use them to navigate your animation, isolate specific time ranges, move/scale keyframes, retime...etc
Known limitation : on versions prior to max 2022 update 2, the toolbar height is by default larger than it should be and doesn't scale down automatically. You can scale it down manually.