Limit how long in advance users can bookYou can set a limit for how far in advance you can make a reservation. If you set a limit it might be easier to administrate.
Limit how long/short a booking can beYou can set a limit for how long or short a booking can be. You might only be able to book a conference room for a whole day and a car for at least one hour.
Booking/unbooking can also be made on a resource or category. You do so by double clicking the resource/category under the tab Book.
UnregisterIn the unbook you set how close to the date you are able to make your cancellation. E.g it is only possible to unbook a course two days before start.