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RemoteFX is a set of Microsoft technologies that you can use in conjunction with RDP.
Sessions that connect to a virtual server or a virtual desktop via the Remote Desktop Protocol (RDP) can take advantage of RemoteFX. In my opinion, Microsoft RemoteFX should be used whenever possible because it delivers some very helpful capabilities.
RemoteFX was first introduced with Windows Server 2008 R2 Service Pack 1, and it delivered two main capabilities (plus some others that were arguably less significant). These capabilities included the ability to virtualize a physical GPU and perform USB redirection for virtual machines running Windows 7.
Windows Server 2012 supported the same capabilities as the original RemoteFX release, although some were updated. For instance, the virtual GPU feature was updated to support DirectX 11. Windows Server 2012 also included some brand new RemoteFX components, such as RemoteFX Adaptive Graphics, RemoteFX Multi-Touch, RemoteFX for WAN and the Media Redirection API. The Windows Server 2012 version of RemoteFX also allows you to virtualize a physical GPU, or it can provide an emulated GPU if the server is not equipped with a suitable GPU.
To use RemoteFX virtual GPU, the server must run Hyper-V and its CPU must support SLAT translation. In addition, Windows Server 2012 servers require a WDDM 1.2 driver and a DirectX 11-compatible graphics card.
With all of that said, the reason I recommend using RemoteFX whenever possible is because RemoteFX has the potential to make a virtual desktop session perform more like a physical desktop. For instance, you can use RemoteFX to enable touch screen monitors or voice over IP calls from within a virtual desktop. RemoteFX also has the potential to greatly improve graphic rendering speed on virtual desktops.
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