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6 Appendix A: Product Behavior

The information in this specification is applicable to the following Microsoft products or supplemental software. References to product versions include released service packs:

  • Windows 7 operating system

  • Windows Server 2008 R2 operating system

Exceptions, if any, are noted below. If a service pack or Quick Fix Engineering (QFE) number appears with the product version, behavior changed in that service pack or QFE. The new behavior also applies to subsequent service packs of the product unless otherwise specified. If a product edition appears with the product version, behavior is different in that product edition.

Unless otherwise specified, any statement of optional behavior in this specification that is prescribed using the terms SHOULD or SHOULD NOT implies product behavior in accordance with the SHOULD or SHOULD NOT prescription. Unless otherwise specified, the term MAY implies that the product does not follow the prescription.

<1> Section Windows 7 and Windows Server 2008 R2 only compose the desktop over a remote desktop session if this field is set to true.

<2> Section Windows 7 and Windows Server 2008 R2 set the value of this field to the locally unique identifier (LUID) of the graphics card adapter that was used to create the surface on the server side.

<3> Section Windows 7 and Windows Server 2008 R2 set the value of this field to the HMONITOR monitor handle of the display monitor that is used to display the surface.

<4> Section Windows 7 and Windows Server 2008 R2 use this message instead of MILCMD_TRANSPORT_SYNCFLUSH to indicate that the Windows Composition Engine enforces synchronization with DirectX content for redirected windows. When running on the same machine and process as the Desktop Window Manager, the Windows Composition Engine waits until any pending asynchronous DirectX content is finished being rendered to redirected windows before sending the reply notification. When running over the network, however, the behavior of the message/notification pair is identical to that of MILCMD_TRANSPORT_SYNCFLUSH.

<5> Section If this packet is not emitted correctly for the root visual, Windows 7 does not render glass correctly when full-screen desktop magnification is turned on.

<6> Section Windows only processes this packet if the window node specified in the targetResource field is attached to a window target resource that rasterizes its own scene graph.

<7> Section Examples of Windows 7 client-side states that would trigger these messages are timeout detection and recovery events in which the driver has detected and recovered from situations where a GPU stops operating.

Windows 7 and Windows Server 2008 R2 clients can send back the following possible error codes:

Value Meaning


No hardware is available.


Display state is invalid.



<8> Section Windows 7 and Windows Server 2008 R2 decorate each top-level window with a set of instructions that draw the glassy blur effect if the Aero theme is selected, on top of which it draws a dynamic highlight effect that simulates environmental reflection and a set of nonclient elements, including the application icon, window title, and Minimize, Restore, Maximize, and Close buttons, depending on window styles.

<9> Section Windows 7 and Windows Server 2008 R2 use actual Win32 HWND values as the window identifiers, as an implementation shortcut. The HWND values are not usable by the client other than as specified by this protocol.

<10> Section On Windows 7 and Windows Server 2008 R2, windowless sprites are used to represent mouse cursors.

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