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some principal questions - OpenGL and DirectX

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this is the first time that i'm asking here, so hopefully my questions are not too stupid. I'm not a software developer, i work as a system administrator.
What i understand from reading the list-archive is that Java 3D is able to "speak" both, DirectX and OpenGL with the graphic adapter.
Do i have as a user the possibility to choose how Java 3D speaks with the graphic adapter, or is there a simple way to find this out ?

How can i find out if my graphic adapter support DirectX/OpenGL ? For DirectX, i can use dxdiag. Is there something similar for OpenGL ?


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