This is parametrically rigged model of PVC (plastic) window.
What does it means? Model have MainControlDummy with Attribute Holder modifier on it. Window has 6 changeable parameters: Width, Height, Left and Right flaps opening horizontally and vertically. Z-position of Main Control Dummy - is the level of window bottom.
Modeled in 3ds max 2014, rendered with Corona (alpha 6) and Corona materials.
For more details, please, watch my tutorial on YouTube how I use it. https://youtu.be/PBwYHie2jzA