Open GL is a standard for using the video card to do some of the work, instead of relying soley on the computer's CPU. That means computer memory and horsepower is freed up, while the video card, that is designed for fast rendering, does much of the work. Most 3D programs are being developed using Open GL to take advatage of the speed increase in display and rendering. Some are already available. Howver, Poser 4 and Poser 5 do not use Open GL. Daz Studio does. Curious Labs hasn't committed to any design changes in P6 yet (if there is one). So, your statement about Open GL being better for preview in Poser is incorrect. If you have a computer purchased in the last couple of years, you probably already have Open GL. I don't know of any being sold now that don't have it.