When I click record button on katalon recorder, which codes are performed?

Hi, All

I am a newer, and I want to catch the other element when click record button on katalon recorder, such as the text in the front of input field, so I want to know which codes will be performed when do the record action? I try to use the chrome developer tool to follow the record action, But can not find the exactly codes related to record action. then if you have some document about it?

Thanks