As a user enters screens, they are saved in a history that can be viewed by clicking on the history icon. The default size of the number of screens that are saved before wrapping (oldest discarded) is 100.
For some environments with older PC's and browsers, 100 screens may be too large a number, so you can reduce this to ensure memory limits are not impacted. Or, for security you may wish to reduce to a low number...for some applications a higher number may provide the best user experience!
