How do you apply a vector mask to a folder in Photoshop CS6?

The ways you apply vector masks in CS6 is different than in CS5.

I knew how to apply a vector mask to a folder of layers in CS5.

I cannot figure out how to do it in CS6.

So my question is:

How do you apply a vector mask to a folder in Photoshop CS6?

And while we're at it, what are the best methods for applying vector masks to regular layers?

Thanks.