SoL OpenGL is an API developer use for 3d acceleration, like direct 3d, glide, etc. GLsetup install the right driver for your specific video card. Usually you download the glsetup template and it checks what your video card is, and then download the right driver. The full version that BS mentioned has ALL the drivers that GL supports, and that's why it's so freaking big. GL setup only runs on win9x too.
Hope that helps. You can try
http://www.glsetup.com/ too
[This message has been edited by SPF-15 (edited June 14, 2001).]