How do I find out what version of OpenGl is on my system

Very simply, I have an ATI Rage 128 Pro ‘partner’ product and am having to use the wind2k driver on winXP as I have no idea who made the card. How do I find out the OpenGl version so I can download the latest? (note I have looked at advanced display proerties and it is not there)

Ok, so this is not the best solution, but if you happen to have Quake 3 or other OpenGL games based on it, there is usually a function to show OGL version and extensions…

Perhaps someone can write a trivial applet to retreive and display this info? =)