6 Appendix A: Product Behavior

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The information in this specification is applicable to the following Microsoft products or supplemental software. References to product versions include updates to those products.

  • Windows Vista operating system

  • Windows Server 2008 operating system

  • Windows 7 operating system

  • Windows Server 2008 R2 operating system

  • Windows 8 operating system

  • Windows Server 2012 operating system

  • Windows 8.1 operating system

  • Windows Server 2012 R2 operating system

  • Windows 10 operating system

  • Windows Server 2016 operating system

  • Windows Server operating system

  • Windows Server 2019 operating system

  • Windows Server 2022 operating system

  • Windows 11 operating system

  • Windows Server 2025 operating system

Exceptions, if any, are noted in this section. If an update version, service pack or Knowledge Base (KB) number appears with a product name, the behavior changed in that update. The new behavior also applies to subsequent updates 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 2.2.1.1.1: The DYNVC_CAPS_VERSION1 PDU is supported only in Windows Vista.

<2> Section 2.2.1.1.1: Windows implementations do not initialize the Sp field. As a result, its value is random.

<3> Section 2.2.1.1.2: The DYNVC_CAPS_VERSION2 PDU is supported in Windows Vista operating system with Service Pack 1 (SP1), Windows Server 2008, Windows 7, and Windows Server 2008 R2.

<4> Section 2.2.1.1.2: Windows implementations do not initialize the Sp field. As a result, its value is random.

<5> Section 2.2.1.1.3: The DYNVC_CAPS_VERSION3 PDU is not supported in Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2.

<6> Section 2.2.1.1.3: Windows implementations do not initialize the Sp field. As a result, its value is random.

<7> Section 2.2.1.2: Windows implementations do not initialize the Sp field. As a result, its value is random.

<8> Section 2.2.3.2: Windows implementations do not initialize this field. As a result, its value is random.

<9> Section 2.2.3.4: Windows implementations do not initialize the Sp field. As a result, its value is random.

<10> Section 3.1.5.3:  Soft-Sync is not supported by the following operating systems: Windows Vista, Windows Server 2008, Windows 7, Windows Server 2008 R2, Windows 8, and Windows Server 2012.

<11> Section 3.1.5.4.4:  Windows implementations do not prepend the Channel PDU Header to tunneled static VC data, but the CHANNEL_FLAG_FIRST flag, CHANNEL_FLAG_LAST flag, and message length are passed to application endpoints.

<12> Section 3.3.3.2:  A DYNVC_CLOSE PDU is sent for channels that failed to be created in Windows Vista operating system, Windows Server 2008 operating system with Service Pack 2 (SP2), Windows 7 operating system, Windows Server 2008 R2 operating system, Windows 8 operating system, and Windows Server 2012 operating system.