The Flock SOP is a custom operator that allows you to do flocking simulations. The download comes with the DLL file for the SOP itself and an example .toe file showing how it works. It does not come with the source code for the operator, only the compiled operator itself.
Warning: The following operator only works on windows TouchDesigner 099 official 64 bit build 14650 or above. Mac OS and 32 bit TouchDesigner versions are not supported.