## Graphics Adapter Device Driver Reference

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### Translation Layers

Translation layers use the CHAININFO structure to gain access to the hardware capabilities and available modes. The VMI_CMD_QUERYCHAININFO function returns the CHAININFO structure.

When the VMIEntry function receives an operation from a translation layer, VMAN checks the function number and either handles the operation or forwards it to the appropriate GRADD. VMAN will handle the operation if the GRADD returns an RC_SIMULATE. The GRADD Model diagram shows how the VMAN component handles communication among the various components and the paths that commands can take during processing.