Reporting Multiple-Head Video Memory
In multiple-head mode, the master head must respond to a call to the driver's DdGetAvailDriverMemory function as if the master head were the only head controlling the multiple-head card. The amount of free memory that the driver returns must include the video memory of any subordinate head whose video memory was surrendered to the master head (that is, any subordinate head that received DdCreateSurface calls with the DDSCAPS2_ADDITIONALPRIMARY bit set).
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