UV map of logos onto chrome surface?

I need to put lettering and logos onto a chrome surface (With ALPHA images *.png).
I know this is possible, I did it once in an older version of Blender a very long time ago.
Anyone have any thoughts on how to do this? I totally forget how this is done.

Somehow, I did managed to got an alpha map to put holes in a chrome surface and even get light to show throw the holse perfectly with ray trace. But this is not what I want.