ResBook has a log system which allows you to track all the things you do within ResBook or users that have access to your ResBook. 

To find the user logs, go to 'Settings > User Logs'. The User Log tracks everything that you do within ResBook, from rates you add to ResOnline inventory updates. Everything is tracked based on the modules. 

You can search the User Log by in two ways. The first is a date search, and the second is a module filter.

As you adjust each, the User Log will adjust to your search settings.