What is this QlikView Log about?

[#1]

Qlikview experts, I'm a newbie to this software, currently II found this Recording Log under " Management Console-->Documents-->Server Objects-->Objects--> Id, Type, Owner

What is it about? Could I delete all these records? If can, how to remove them?

Thanks a lot for any help. : (

[#2]

This is a list of bookmarks created by the users on the server. Why would you want to delete?