Instant App Access feature
Well, the important key feature of XenApp 6.5 is Instant App Access. It creates an ICA session with the servers as the user logs into Citrix Receiver, reducing significant session creation time. When the user launches an application in the Citrix server, the session already in the cache launches immediately. This prelaunch process reduces the application launch times because the ICA session is created before the user click on an application icon.

HDX enhancements
Citrix XenApp 6.5 enhances the HDX protocol feature that came with XenDesktop 5.5. The significant updates to HDX Media Stream for Adobe Flash content can be rendered locally over more network conditions than before. The audio and video rendering redirection capability dynamically uses computing resources at the endpoint, resulting in higher server scalability and an improved user experience, even in high-latency situations.

Multi-Stream ICA
The Multi-Stream ICA technology allows XenApp ICA traffic to be delivered over the four TCP/IP streams. This larger pipe for data gives administrators more granular control for QoS routing rules. The users will experience superior audio/visual quality for apps delivered over the WAN without disrupting other HTTP traffic.

Increased device support
XenApp 6.5 with the Citrix Receiver 3.0 supports extreme multitasking, faster Windows app performance and advanced Linux device support. It enables XenApp to work with more devices including PCs, Macs, tablets, smartphones and thin clients and also major device OSs, including Apple iOS, Google Android and Chrome OS.

End-user GUI experience
New XenApp features include built-in Windows themes and the users will get an improved desktop experience, the installation of accessory apps and the ability to display high-resolution wallpapers. The complete graphical effect of Windows 7, give users the look and feel of a Windows 7 desktop.
Citrix XenApp 6.5 can be based on a locked-down image of a hosted shared desktop, allowing an increase in server density and improved security.

Troubleshooting and management console
The single enhanced App Center console gives more management features for administrators. The new Desktop Director gives a single console for managing, monitoring and troubleshooting virtual desktops and applications for all users.

Improved server farm management
While installation and managing XenApp 6.5 the Dynamic Data Center Provisioning feature provides administrators to create “controller” or “worker” roles in a server farm which can be directly associated with the Active Directory OUs and Groups thereby GPOs.

Better printing
Citrix XenApp 6.5 gives about 90% reduction in bandwidth needed for print jobs for the users who print from virtual applications.