For those wanting a visual depiction of the various modes, see
here. Not every function there is in Tango, but it seems like the other way around is true. If you hover over a graph, it'll show an actual animation.
mk
is the file just there to be useless or is there a way to load it
it's a resource
for scripters
you don't install/load/download it unless you are you using it for an add-on
that's why it's in modification discussion