As the roar settles from Monday's iPhone 3G S announcement, the skeptical are looking closer at all the details surrounding Apple's latest moves, and they are finding some potentially sticky issues.

One of which, as noted by the enthusiast blog Engadget, is an incompatibility in the graphics libraries in the iPhones. The iPhone 3G uses the OpenGL ES 1.1 library while the 3G S uses the OpenGL ES 2.0, and the two are not compatible. In fact, they are on separate development tracks.

OpenGL is a graphics library first developed in the 1990s by Silicon Graphics, which was known for its graphically-rich Unix workstations. On Windows, OpenGL has been supplanted by Microsoft's DirectX multimedia library, but OpenGL remains popular in many other platforms.

SGI would later turn over OpenGL to a standards body to maintain and port to other platforms. These days, it is maintained by The Khronos Group, a consortium that maintains several open standards.

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