## Display Device Driver Reference for OS/2

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### Base Video Handler

The Base Video Handler controls the video hardware in OS/2 protect mode. It means that all applications that set the video mode call BVH indirectlty. BVH consists of multiple DLLs.

When the display adapter is VGA, the BVH consists of BVHVGA.DLL and BVHVGA2 .DLL. BVHVGA2.DLL handles the DBCS fonts and BVHVGA.DLL handles the other functions. BVHVGA2I.DLL is the mini BVH used only at system installation.

BVHSVGA.DLL is the BVH for super VGA and is compatible with many kinds of the super VGA chip sets.

BVHWNDW.DLL is the BVH for windowed VIO session.

For more details see OS/2 Physical Device Driver Reference.