This section shows all attributes for the currently selected Particle Flocker Node. You can see the currently selected node in the drop down menu in the Scene Options Rollout section.
Each attribute controls a different property of the flocking simulation. Full details on each attribute can be found in the Particle Flocker Attributes section.
You can also modify the output type of each of these attributes in this section by pressing the small blue arrow to the right of any attribute and selecting the attribute output type. Further details about the attribute output type can be found in the Attribute Output Types section.
Additional options related to the Particle Flocker Attributes can be accessed by selecting the blue cog icon at the top-left of the section.