How exactly Angle randomizer does?

I'm writting instruction of particles object for my community (in korean).

But now I saw Angle randomiser works, and tried to understand how this movement works. I read the explain at bottom of properties bar, and It says "RandomAngle/s"..

And I can't explain it exactly. I know It means changing angle of motion of particles. but, how It changes? What is based to change that angle?

Is that per every tick? (Is it sets random angle change each tick?)... what is base of rotation angle change? how can it be per second?? I'm confused...

Try this exe -> http://dl.dropbox.com/u/1013446/forumhelp/anglerandomizer.exe

drag the red handle left and right to see different values for Angle Randomizer.

Angle Randomizer sets the maximum angle any one of the particles can turn in one second.

Try it around the lower values (between 0 and 30) especially to get a clear picture of how to use and explain it.

<img src="http://dl.dropbox.com/u/1013446/forumhelp/anglerandomizer.png" border="0">