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==Features==
===Windowing system interfaces===
On OS X, CGL is the foundation layer of windowing system interfaces to OpenGL. Both AGL (Apple OpenGL) and the [[Cocoa (API)]] (or AppKit) have interfaces to OpenGL and are logical software layers and depend on CGL for their behavior. CGL and AGL interoperate freely. CGL and Cocoa may be used together, however Cocoa classes may implicitly make changes to CGL state. Function calls from AGL and Cocoa should not be mixed.
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