Windows Rally

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Windows Rally is a set of technologies from

(QoS) and diagnostics for data sharing, communications, and entertainment. Windows Rally technologies provide provisioning for the following devices:

• Wireless access points, PCs, and servers
• Network
  game consoles
• Digital media receivers, network media players, set-top boxes, digital photo frames, and PDAs

Windows Rally technologies

Windows Rally includes the following set of technologies:

LLTD

The Link Layer Topology Discovery (LLTD) protocol enables applications to discover devices and determine network topology. In Windows Vista, it enables a graphical view of all the devices in the network on the Network Map. For Windows XP computers to appear on the Network Map, the LLTD Responder must be downloaded and installed. Devices that provide audio or video playback or that are bandwidth sensitive can implement the QoS Extension part of the protocol so that they receive prioritized streams and that changes in available bandwidth have less impact on the playback experience.

qWAVE

Windows Vista includes qWAVE, a pre-configured quality of service API for time-dependent multimedia data, such as audio or video streams. qWAVE uses different

priority schemes for real-time flows (such as multimedia packets) and best-effort flows (such as file downloads or e-mails) to ensure that real-time data gets delayed as little as possible, while providing a high-quality channel for other data packets. qWAVE-enabled applications together with devices that implement the LLTD QoS Extensions aim to improve an end user's experience of streaming video by prioritizing traffic and reducing the effects of network-related transient issues.

Windows Connect Now

Windows Connect Now (WCN) is the name of Windows Rally technologies aimed for simpler wireless device configuration. With Windows Connect Now, users running Windows Vista or Windows XP SP2 can create network configuration settings and transmit them to the access point. Alternatively, users can also print the configuration settings for reference for manually configuring the device. With Windows Connect Now, one of the following methods may be used for easier configuration:

• WCN-NET is Microsoft's implementation of the
  Extender by using UPnP
  , authenticate with the device by using a personal identification number (PIN), provide wireless settings that are based on user selection and set up a wireless network over a wired Ethernet connection. Windows XP and earlier Windows versions do not support WCN-NET.
• WCN-UFD uses an API and an
  USB Flash Drive
  for more secure wireless networks. Windows XP Service Pack 2 and later Windows operating systems supports WCN-UFD.
• WCN-MTP includes a Media Transfer Protocol (MTP) extension that enables an MTP initiator to provide an MTP responder with configuration parameters for joining a wireless network and supports more secure configuration of MTP-capable devices on wireless networks. In Windows Vista, a temporary USB cable connection can be used for MTP-class devices such as portable media, digital cameras etc.

Devices Profile for Web Services

The Devices Profile for Web Services (DPWS) standard defines a minimal set of implementation constraints to enable secure

technology, supports standards for device connectivity such as WS-Discovery and WS-Eventing and includes numerous extension points allowing for integration of device-provided services in enterprise-wide application scenarios and roaming devices that work across the Internet.

In Windows Vista, Web Services for Devices (WSDAPI) is an unmanaged code implementation of the Devices Profile for Web Services (DPWS) standard. The Windows Communication Foundation (WCF) executes managed code and offers enterprise-level services for Web Services solutions on Windows XP and Windows Vista.

Function Discovery

To support Simple Service Discovery Protocol (SSDP) and WS-Discovery, and for extensible discovery to support other protocols, Windows Vista includes the Function Discovery API. Function Discovery serves as an abstraction layer between applications and devices, allowing applications to discover devices by referencing the device's function, rather than by its bus type or the nature of its connection. The Function Discovery API aims to create applications that enumerate system resources, use devices of a specific type and discover and manage lists of devices or objects, which are sorted by functionality or class, whether local or network connected. Function Discovery supports an extensible discovery provider model. Vendors can also create a custom provider to expose resources through Function Discovery.

Plug and Play Extensions (PnP-X)

PnP-X uses SSDP and WS-Discovery network communication protocols to make network-connected devices as discoverable as those that are connected directly to a computer over a bus such as

Universal Plug and Play

Universal Plug and Play (UPnP) is an

device description document that the device hosts. The device description also lists properties such as device name and icons associated with the device. UPnP has been adopted widely for devices that interact in home network audio-video scenarios.

UPnP is supported by Windows Me, Windows XP and Windows Vista. In Windows Vista, UPnP is integrated with PnP-X and Function Discovery.

See also

• Windows Vista networking technologies
• Web service
• Windows Communication Foundation

References

External links

• Windows Rally Technologies Homepage
• Windows Rally Development Kit