Looking for mixed Unix/Windows secure coding course

Hi. My company (based in US) is a mixed environment with an application on 
both Windows and a Unix variant. We would like to have a common course for 
"both sides of the house" to provide a consistent message rather than a 
each marching to their own tune.

Does anyone know of any companies which offer this? Preferably one we could 
bring on site.

Thanks in advance,

Hollis