Shadows for Soft Particles

I was just wondering, how did you go about rendering the shadows for the soft particles?
You mentioned it in this post: Sunday, November 2, 2008, Advanced Shadows

Thanks,
Mikfig

hi
i use second rt to store color information (diffuse map and color), when i compute shadows using the first rt, i multiple the result with the second rt (which is also projected like shadow rt)
simple but do the work

Interesting, thanks