XenDesktop 4 introduces several new HDX features that improve the user experience when working with virtual desktops and applications. Key features include enhanced Flash redirection, plug-and-play multi-monitor support, improved smartcard support, enhanced USB support including for webcams, and integration with Citrix Branch Repeater for acceleration. XenDesktop 4 also provides support for 64-bit guest operating systems and multi-forest Active Directory deployments. New products like HDX 3D Professional Graphics extend XenDesktop to support 3D graphics-intensive workflows.