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Web server: A computer that delivers web pages to browsers, and other files to applications by way of the HTTP protocol. A web server includes the hardware, operating system, web server software, TCP/IP protocols, and site content. A web server typically accepts HTTP requests from clients and serves them HTTP responses that contain optional data, which are usually web pages such as HTML documents, and linked objects such as images.

Web services: A software system designed to support interoperable machine-to-machine interaction over a network, using XML-based standards and open transport protocols.

Web Services Description Language (WSDL): An XML format for describing network services as a set of endpoints that operate on messages that contain either document-oriented or procedure-oriented information. The operations and messages are described abstractly and are bound to a concrete network protocol and message format in order to define an endpoint. Related concrete endpoints are combined into abstract endpoints, which describe a network service. WSDL is extensible, which allows the description of endpoints and their messages regardless of the message formats or network protocols that are used.

Web Services Reliable Messaging (WSRM) Protocol: A protocol that defines mechanisms that enable web services to ensure delivery of messages over unreliable communication networks. The WSRM Protocol allows different operating and middleware systems to reliably exchange these messages.

well-known endpoint: A preassigned, network-specific, stable address for a particular client/server instance. For more information, see [C706].

well-known security identifier: One of a number of security identifiers (SIDs) that has a constant value.

window menu: A context menu associated with a window or notification icon that contains a list of common operations to perform such as minimize, maximize, move, and so on.

Windows-1252 character set: An 8-bit character encoding of the Latin alphabet used by default in most legacy components of Windows. Sometimes referred to as an "ANSI" character set, this is a misnomer because a Windows-1252 character set is not an ANSI standard code page; it is properly described as a "single byte code page". The Windows-1252 character set is defined in [Windows-1252]. Windows is now based on Unicode, so the use of the Windows-1252 character set is strongly discouraged unless it is used to interoperate with legacy applications or legacy data.

window coordinates: Coordinates relative to the top-left corner of the window.

window visible region: The portion of the window that is not obscured by other user interface elements.

Windows error code: A 32-bit quantity where zero represents success and nonzero represents failure. The specific failure codes are specified in [MS-ERREF].

Windows Internet Name Service (WINS): A name service for the NetBIOS protocol, particularly designed to ease transition to a TCP/IP based network.

Windows Management Instrumentation (WMI): The Microsoft implementation of Common Information Model (CIM).

Windows metafile format (WMF): A file format used by Windows that supports the definition of images.

Windows NT account name: A string identifying the name of a Windows NT account.

Windows NT domain: A domain hosted entirely on Windows NT 4.0 servers.

Windows NT domain name: A string identifying the name of a Windows NT domain to which an identity belongs.

Windows NT password: A string of 0 to 256 case-sensitive Unicode (as specified in [RFC2781]) characters used to prove entitlement to a Windows NT account.

Windows registry: The Windows implementation of the registry.

Windows security descriptor: A Windows NT security descriptor.

Windows Server Enterprise: A version (also referred to as a Stock Keeping Unit (SKU)) of the Windows Server 2003 R2 operating system.

Windows Time Service (W32Time): A service that supports time synchronization against network and hardware time sources. For more information, see [WTSREF] and [MS-SNTP].

wireless Local Area Network (WLAN): A local area network (LAN) to which mobile users (clients) can connect and communicate by means of high-frequency radio waves rather than wires. WLANs are specified in the IEEE 802.11 standard [IEEE802.11-2007].

WMI Query Language (WQL): A subset of American National Standards Institute Structured Query Language (ANSI SQL). It differs from the standard SQL in that it retrieves from classes rather than tables and returns CIM classes or instances rather than rows.

writable naming context (NC) replica: A naming context (NC) replica that accepts originating updates. Partial replicas are not writable.

writability: The abstract feature capability representing the ability of a domain controller (DC) to accept modifications and issue originating updates, with respect to a given naming context (NC) replica.

write-protect: An attribute of storage media denoting that the media is not available to be written.

WSDL message: An element that describes the data being exchanged between web service providers and clients.

WSDL operation: A single action or function of a web service. The execution of a WSDL operation typically requires the exchange of messages between the service requestor and the service provider.

WSDL port type: A named set of logically-related, abstract Web Services Description Language (WSDL) operations and messages.

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