The Browser is the placeholder for all your toolpaths.
All toolpaths are organized in setup folders which describe the physical setup (e.g. your work coordinate system). A complete program is composed of one or more individual operations which contain the actual generated toolpath (cutter location information). For more complex setups, it can be useful to organize the operations into subfolders.
The ordering of the setups and operations within the Browser is also the ordering that is generally reflected in the final NC program or when simulating the toolpath. Toolpath patterning and tool reordering are the only features that can influence the listed order.
The Browser
You can navigate the Browser by using your keyboard arrow keys.