All Master windows have Hot Area, the Hot Area has one or occasionally two fields which contain unique information to identify the record.
It is important to note that while you are in the hot area you are not actually in the record.
This means that you cannot make any changes. For this reason, the Tick and Cross Buttons are disabled (they are shadowed and you can not activate them) while the curser is in the How Area.
While still in the Hot Area, you can view records using the Navigation Toolbar at the top of the screen. Using the different icons on the toolbar, you can: