Trace actions of ConfTool Pro users who registered for conference participation

We want to trace all personal actions of a particular participant within the system, e.g. change of personal data, registration data and payments.
Where can we get such an overview?

Users with user role Conference Administrator can access a log of the most relevant user actions.

Please go to:
Overview => User and Participant Management => List of All Users
Click on the name of a specific user to show this user's details.
On the right side, click on “User Log” to open a list with all user related events (see image 1).
The log also gives you the option to filter for specific entries or actions and to determine the time frame (see image 2).

If you want to trace actions related to abstract or paper submissions, please have a look at the information to be found in this forum entry:
Retrace (and restore) the assignment of submissions to authors and other updates to papers