 Some private homes keep visitors' books.Specialised forms of guestbooks include hotel registers, wherein guests are required to provide their contact information, and Books of Condolence, which are used at funeral homes and more generally after notable public deaths, such as the death of a monarch or president, or after a public disaster, such as an airplane crash.On the web, a guestbook is a logging system that allows visitors of a website to leave a public comment.