Publishing Individual Applications
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In the case where a XenApp farm is used to deploy only one application or a small selection of applications to end users, the published application option has many benefits A published application can be published directly to a user s Windows desktop using Citrix Program Neighborhood or directly to a web browser interface using Citrix Web Interface Citrix offers three options for delivering published applications to a desktop or laptop: Citrix Program Neighborhood, Citrix Program Neighborhood Agent (PN Agent), and Web Interface Program Neighborhood Agent addresses many of the issues that existed with the original Program Neighborhood With PN Agent, an administrator simply points the agent to the Web Interface server, and when users connect, PN Agent populates users desktops, Start menus, or system trays with all their published applications Additionally, Program Neighborhood Agent addresses the problem of the local operating system s not knowing to open files using a published application rather than a local application Program Neighborhood Agent changes all the local desktop MIME type associations to the appropriate published application from the server (Content Redirection) The Program Neighborhood Agent can be controlled by an administrator with their deployment method of choice (Active Directory, for example) with no user changes available The administrator may also allow the user to make some configuration changes such as where the Web Interface server is or where the icons are placed in their environment The advantage of using PN Agent as well as Web Interface for application delivery is that both methods use a centralized configuration source Unlike Program Neighborhood, all the settings for getting users to their applications are held on the server and not the client This makes it easy for administrators to make changes to the environment without having to touch all the clients The other benefit is that the users cannot make changes to the client either, which keeps curious users from disrupting the connections Published applications are more secure than a published desktop, because users are not granted access to administrative or desktop tools, or to basic operating system tools such as the Start menu Without this access, it is very difficult for users (authorized or unauthorized) to do harm to the system, although a hacker can find back doors in some published applications (such as Internet Explorer)
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The Client Environment
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Published applications also tend to use system resources on the server far more efficiently, because less memory and processor power are required when the desktop is not being used Also, users tend to log out of their sessions more often in a published application scenario, because they often close applications without logging out of their desktop The significant downside to published applications, though, is that they can be confusing to end users users find it difficult to distinguish between applications that are running locally and applications published from the XenApp farm Additionally, the fact that users cannot access configurations such as printer settings can cause challenges, because the user is only running the application and not the full interface, which provides access to the printer Control Panel
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For environments in which all or most applications will be provided to users via the XenApp Servers, and infrastructures with a majority of thin clients, we strongly recommend publishing the full desktop as opposed to just the applications Although publishing the full desktop requires the desktop lockdown discussed in the next section, the published desktop is simpler and more intuitive for end users With a published desktop, end users see the full interface they are accustomed to seeing, whereas from a hybrid client a user will see two Start menus (if the published desktop is set up to run as a percentage of the screen size) to make it more obvious whether they are using an application locally or from the XenApp farm Additionally, thin clients based on Linux do not intuitively switch between published applications, whereas if the desktop is published, the normal hot keys and windowing controls hold true to what users are accustomed to In the past, the recommendation used to be to shy away from the published full desktop Using GPOs to secure a desktop is still a challenge for IT administrators It takes days to get a desktop environment in a safe and secure state Today, with third party add-ons such as RES PowerFuse and Enteo, locking down the desktop is not as daunting a task as it has been What used to take days can now be done in hours and with less frustration This will make delivering a full desktop a viable option for application delivery Other desktop delivery methods that are worth a quick mention but are outside the scope of this book are XenDesktop from Citrix and VDI (Virtual Desktop Infrastructure) from VMWare These technologies take another approach to desktop delivery and might provide some nice alternatives to traditional published desktops For more information go to wwwcitrixcom and wwwvmwarecom, respectively
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