http://searchvirtualdesktop.techtarget.com/news/1370602/What-is-Citrix-HDX
Citrix recently revealed the newest version of its desktop virtualization product, XenDesktop 4. XenDesktop 4 has a lot of new features, one of them being an update to HDX.
But what is HDX?
First and foremost, HDX is not a feature or a technology -- it is a brand. Short for "High Definition Experience," HDX is the umbrella term that encapsulates several different Citrix technologies.
HDX came to be because Citrix is finally getting competitive pressure on its Independent Computing Architecture (ICA) protocol. ICA has always had a good reputation and has generally been perceived as a differentiator for Citrix.
But now, Microsoft's Remote Desktop Protocol Version 7 is leaps-and-bounds better than any previous version, and VMware is just a few months away from releasing a software version of Teradici's PC-over-IP protocol.
Citrix's reaction to these competitive pressures has been to elevate the conversation above the protocol. Citrix must think, "What's the goal of improving a remote display protocol, when the goal of a protocol is to provide a great user experience?"
In other words, a great user experience is more than just a protocol, and Citrix created the HDX brand to discuss all the elements -- in addition to ICA -- that Citrix claims allow it to deliver the best user experience.
Citrix has created several sub-brands under HDX, such as HDX MediaStream, HDX RealTime and HDX 3D. Each of these brands has a variety of technologies
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http://www.ivdi.com/blog/high-definition-experience-hdx-with-ivdi/
Many of you have sent us a very positive feedback about iVDIsince its inception. The common adjectives we hear about the iVDI experience is ‘magical’. Users have been amazed with the fluidity of this whole ecosystem and how slower internet speeds rarely disrupt your session.
To be honest, the magic lies within a set of technologies namedHigh Definition Experience or HDX. This set of technologies has been developed by Citrix to leverage the use of virtual desktops. The benefit of using HDX on virtual desktop infrastructure (VDI) is its adaptability in relation with available bandwidth. Slower internet speed does not falter the performance of your VDI when it uses HDX.
How it works
Although regarded as a protocol, HDX is much more than that; it works like a well-oiled machine. To achieve this, the HDX engine has been divided into smaller components based on function. All parts of the HDX engine work in cohesion, making sure that the whole process of desktop virtualization is fluid and seamless.