- What's new
- System requirements
- Technical overview
- Install and configure
- Upgrade and migrate
- SDKs and APIs
At the device
HDX leverages the computing capacity of user devices to enhance and optimize the user experience. HDX MediaStream technology ensures users receive a smooth, seamless experience with multimedia content in their virtual desktops or applications. Workspace control enables users to pause virtual desktops and applications and resume working from a different device at the point where they left off.
On the network
HDX incorporates advanced optimization and acceleration capabilities to deliver the best performance over any network, including low-bandwidth and high-latency WAN connections.
HDX features adapt to changes in the environment, balancing performance and bandwidth by applying the best technologies for each unique user scenario, whether the desktop or application is accessed locally on the corporate network or remotely from outside the corporate firewall.
In the datacenter
HDX leverages the processing power and scalability of servers to deliver advanced graphical performance, regardless of the capabilities of the client device. Compressed multimedia information is sent directly to the user device in its native format.
HDX channel monitoring provided by Citrix Director displays the status of connected HDX channels on user devices.
HDX Insight, the integration of EdgeSight Network Inspector and EdgeSight Performance management with Director, captures data about ICA traffic and provides a dashboard view of real-time and historical details such as client-side and server-side ICA session latency, bandwidth use of ICA channels, and the ICA round trip time value of each session.
By default, HDX delivers a highly responsive Windows Aero or Windows 8 desktop experience to virtual desktops accessed from supported Windows user devices. To do that, HDX leverages the graphics processing unit (GPU) or integrated graphics processor (IGP) on the user devices for local DirectX graphics rendering. This feature, named desktop composition redirection, maintains high scalability on the server. For details, see What to do with all these choices in http://blogs.citrix.com/2013/11/06/go-supersonic-with-xendesktop-7-x-bandwidth-supercodecs/.
HDX webcam video compression improves bandwidth efficiency and latency tolerance for webcams during video conferencing in a session. This technology streams webcam traffic over a dedicated multimedia virtual channel; this uses significantly less bandwidth compared to the isochronous HDX Plug-n-Play support, and works well over WAN connections.
Citrix Receiver users can override the default behavior by choosing the Desktop Viewer Mic & Webcam setting Don't use my microphone or webcam. To prevent users from switching from HDX webcam video compression, disable USB device redirection with the policy settings under ICA policy settings > USB Devices policy settings.
If a webcam supports H.264 hardware encoding, HDX video compression uses the hardware encoding by default. Hardware encoding uses additional bandwidth and is not suitable for a low bandwidth network. To force software compression over low bandwidth networks, add the following DWORD key value to the registry key: HKCU\Software\Citrix\HdxRealTime: DeepCompress_ForceSWEncode=1.
For deployments where server scalability is of greater concern than user experience, you can use the legacy graphics system by adding the Legacy graphics mode policy setting and configuring the individual legacy graphics policy settings. Use of the legacy graphics system affects the user experience over WAN and mobile connections.