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Citrix XenApp™ (the new name of Presentation Server) enables IT organizations to reduce the costs of delivering applications dramatically by centralizing management, security and control of applications and data. Application virtualization is the principal technology that enables this simplified and consolidated control. It provides a flexible application delivery system that can select the best method dynamically, based on the user, application and network.
Server-Side Application Virtualisation
XenApp virtualizes applications by separating where the application is used from where it runs. All components of applications are installed, maintained and secured in the data center, while only screen displays, keyboard entry and mouse movements traverse the network. IT consolidates application management centrally, while enabling users the freedom to operate from any location, on any device, over any network. View a demonstration of server-side application virtualisation with XenApp.
Client-Side Application Virtualisation
XenApp includes client-side application virtualization to address any Windows-based application — even those that need local desktop CPU resources, require local peripherals, or are used offline by mobile workers. Client-side application virtualization streams Windows applications to desktops and laptops as an on-demand service, while eliminating application conflicts and simplifying application updates. | 
