Particles Collision

Unity Engine
1

I want some particles to have colliders. Not in the sense of a world particle collider, but so that every individual particle will return data when it hits something. Any ideas?

2

Will this checkbox do it?

"If Send Collision Message is enabled, any particles that are in a collision will send the message OnParticleCollision to both the particle’s GameObject and the GameObject the particle collided with.
Hints
* Send Collision message can be used to simulate bullets and apply damage on impact.
* Particle Collision Detection is slow when used with a lot of particles. Use Particle Collision Detection wisely.
* Message sending introduces a large overhead and shouldn’t be used for normal particle systems."

http://unity3d.com/Documentation/Manual/Particle%20Systems.html