The PageList.txt file is a text file that is responsible for recording the page change buttons that have been added to the Display Manager's navigation bar. The PageList.txt file pertains to all users for an application with unimplemented security, or for users that are not logged on to the application.
Once security has been implemented for an application, VTS also keeps a record of the page change buttons that have been configured for each user's account. These are stored in files named, "ListX.txt", (where X is a number starting at 0).