Here are the data structures with brief descriptions:

DEBUG_DATA_BREAKPOINT_TYPE
DEBUG_DATA_CLEAR_HW_BREAKPOINT
DEBUG_DATA_CPUID
DEBUG_DATA_IA32_FX_SAVE_STATE
DEBUG_DATA_IA32_SYSTEM_CONTEXT
DEBUG_DATA_READ_IO
DEBUG_DATA_READ_MEMORY
DEBUG_DATA_READ_MSR
DEBUG_DATA_READ_REGISTER
DEBUG_DATA_RESPONSE_ARCH_MODE
DEBUG_DATA_RESPONSE_BREAK_CAUSE
DEBUG_DATA_RESPONSE_CPUID
DEBUG_DATA_RESPONSE_GET_EXCEPTION
DEBUG_DATA_RESPONSE_GET_REVISION
DEBUG_DATA_RESPONSE_GET_VIEWPOINT
DEBUG_DATA_RESPONSE_READ_IO
DEBUG_DATA_RESPONSE_READ_MSR
DEBUG_DATA_RESPONSE_SEARCH_SIGNATURE
DEBUG_DATA_RESPONSE_SET_SW_BREAKPOINT
DEBUG_DATA_SEARCH_SIGNATURE
DEBUG_DATA_SET_DEBUG_SETTING
DEBUG_DATA_SET_HW_BREAKPOINT
DEBUG_DATA_SET_SW_BREAKPOINT
DEBUG_DATA_SET_VIEWPOINT
DEBUG_DATA_WRITE_IO
DEBUG_DATA_WRITE_MEMORY
DEBUG_DATA_WRITE_MSR
DEBUG_DATA_WRITE_REGISTER
DEBUG_DATA_X64_FX_SAVE_STATE
DEBUG_DATA_X64_SYSTEM_CONTEXT
DEBUG_PACKET_HEADER