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<blockquote data-quote="toddbailey" data-source="post: 67415" data-attributes="member: 20080">From the online help for Visual studio .netVideoPortCreateSecondaryDisplay[This is preliminary documentation and subject to change.]The VideoPortCreateSecondaryDisplay function enables dual-view support by creating a secondary device object for the given device.VP_STATUS&nbsp; VideoPortCreateSecondaryDisplay(&nbsp; &nbsp; IN PVOID&nbsp; HwDeviceExtension,&nbsp; &nbsp; IN OUT PVOID&nbsp; *SecondaryDeviceExtension,&nbsp; &nbsp; IN ULONG&nbsp; ulFlag&nbsp; &nbsp; );ParametersHwDeviceExtension Pointer to the miniport driver's device extension. This is the hardware extension for the device that wants to create additional display device objects. SecondaryDeviceExtension Pointer to the location in which to store the hardware device extension for the secondary display device. ulFlag Is a set of attributes for the secondary display device. This parameter is restricted to the following value:Value Meaning VIDEO_DUALVIEW_REMOVABLE The secondary view can be removed. Return ValueVideoPortCreateSecondaryDisplay returns NO_ERROR if the secondary display device was successfully created. Otherwise, this function returns an error code. HeadersDeclared in video.h. Include video.h.CommentsThis function is available in Windows XP and later.In Windows XP and later, a removable logical device will never become the primary display.Note that on some editions of Windows XP, VideoPortCreateSecondaryDisplay can deliberately fail to enable Dualview. In such cases, the display driver should remain in SingleView mode.When the video minport driver calls VideoPortCreateSecondaryDisplay, the value of the ulFlags parameter must be equal to VIDEO_DUALVIEW_REMOVABLE, which is defined in ntddvdeo.h.The flags VIDEO_DUALVIEW_PRIMARY and VIDEO_DUALVIEW_SECONDARY, which are defined in ntddvdeo.h, are for internal use only. The video miniport driver must never set these flags.Callers of VideoPortCreateSecondaryDisplay must be running at IRQL = PASSIVE_LEVEL.</blockquote>

[QUOTE="toddbailey, post: 67415, member: 20080"] From the online help for Visual studio .net VideoPortCreateSecondaryDisplay [This is preliminary documentation and subject to change.] The VideoPortCreateSecondaryDisplay function enables dual-view support by creating a secondary device object for the given device. VP_STATUS VideoPortCreateSecondaryDisplay( IN PVOID HwDeviceExtension, IN OUT PVOID *SecondaryDeviceExtension, IN ULONG ulFlag ); Parameters HwDeviceExtension Pointer to the miniport driver's device extension. This is the hardware extension for the device that wants to create additional display device objects. SecondaryDeviceExtension Pointer to the location in which to store the hardware device extension for the secondary display device. ulFlag Is a set of attributes for the secondary display device. This parameter is restricted to the following value:Value Meaning VIDEO_DUALVIEW_REMOVABLE The secondary view can be removed. Return Value VideoPortCreateSecondaryDisplay returns NO_ERROR if the secondary display device was successfully created. Otherwise, this function returns an error code. Headers Declared in video.h. Include video.h. Comments This function is available in Windows XP and later. In Windows XP and later, a removable logical device will never become the primary display. Note that on some editions of Windows XP, VideoPortCreateSecondaryDisplay can deliberately fail to enable Dualview. In such cases, the display driver should remain in SingleView mode. When the video minport driver calls VideoPortCreateSecondaryDisplay, the value of the ulFlags parameter must be equal to VIDEO_DUALVIEW_REMOVABLE, which is defined in ntddvdeo.h. The flags VIDEO_DUALVIEW_PRIMARY and VIDEO_DUALVIEW_SECONDARY, which are defined in ntddvdeo.h, are for internal use only. The video miniport driver must never set these flags. Callers of VideoPortCreateSecondaryDisplay must be running at IRQL = PASSIVE_LEVEL. [/QUOTE]

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