This allows the user to connect to their virtual desktop or applications from any device. Provisioning Services provides desktops to be provisioned and re-provisioned in real time, from a single shared disk image.
It is a characteristic feature of XenDesktop, applying NetBoot to virtual machines while simplifying large-scale deployment and master image management. Since the operation of a virtual desktop is highly dependent on the network, the performance quality of that network becomes very important. Citrix uses HDX as a generic term to refer to functions that, through the proprietary protocol ICA for screen transfers, optimize the handling of peripheral equipment and performance in transmitting content such as audio or video.
With VDI, selecting the location of the virtual machine that the user will access also becomes important. While XenDesktop is software designed to implement virtual desktops, XenApp is software designed for the virtualization of applications. Although, by deploying the entire desktop screen, you can use this similarly to desktop virtualization. The main difference is how the two are configured. With SBC, a single hardware instance can be shared with multiple users, thus enabling higher resource efficiency compared to VDI.
Moreover, since a stand-alone application can be transmitted, in practice there is a lot that can be done with application virtualization. With application virtualization, users can access these same applications regardless of the type of terminal or OS they are using.
Unlike in desktop virtualization, where the application can be accessed once you have logged in through another desktop, with application virtualization you can connect to and use individual applications, thus making user operations much simpler.
In other words, the difference between XenDesktop and XenApp lies in whether the object of virtualization is a desktop or an application.
Rather than being a matter of which solution is better, it is more important to select the solution that best fits a particular goal or determine what can be done with a combination of these services. Since the features of both XenDesktop and XenApp are managed with the same architecture, it is possible to implement both solutions and utilize them under a single management system. This compatibility is reflected not only in architecture, but also in licensing; XenDesktop Enterprise and Platinum licenses are both compatible with XenApp.
Thus, rather than viewing these as mutually exclusive solutions, making use of both XenDesktop and XenApp will result in more flexible functionality.
At the same time, since multiple configurations are being mixed together, it is also necessary to consider monitoring and operation management software that is compatible with these systems. XenDesktop and XenApp are both systems with increasingly high demands for promoting information security and telecommuting.
However, as mentioned above, such systematic components can be complicated, and are likely to affect system availability and performance. You need facts! While RDP as mostly a one-trick pony which we can do some adjustments in Group Policy to adjust the bandwidth usage or using regular QoS, it is still quite limited to the networking stack of the Windows NDIS architecture, which is not really adjustable.
But again this shows that we have different protocols that we can use for different use-cases, or different flavours if you will. Another trick to it is that in most cases, XenDesktop is deployed behind a NetScaler Gateway, which has loads of options to customize TCP settings at more granular level then we could ever do in Windows without messing in Registry in some cases.
So is RDP a good enough protocol for end-users? Sure it is! With RDS there is no straight forward solution do to image management. But a downside to this is that it requires Hyper-V in order to be able to do this using Server Manager. Citrix on the other hand has many more options in terms of management OS image management. So virtual machines and physical machines can be configured with PXE boot and stream and operating system down and store in RAM.
Doing updates to the image just requires an reboot. Another thing to think about here is the hypervisor support, where in most cases PXE supports both physical and virtual. A key benefit would be a reduction in storage costs.
When paired with Citrix Provisioning services, a single XenApp server can support around user sessions yet only require 15 GB of shared storage.
Compare that to a VDI solution that would require one terabyte of storage to host the same number of users. Further, you can simplify image management such as updating and patching. Just build a single server image with all the settings, policies, and requested applications. This vDisk can also be provisioned on demand.
When you need to deploy patches or updates, you can do so via centralized image management. XenDesktop uses technology similar to XenApp, but it works to virtualize and run desktops from a centralized location. Not only does this help to improve data security, but it significantly reduces the costs of running a farm of physical desktops. Each person is isolated in their connection to XenDesktop so there are no issues with performance or workload because each person has their own virtual machine and personal vDisk.
If, in the rare case that a system is broken, your Citrix managed service provider can quickly provision a new replacement desktop with files already in sync. With remote work quickly becoming the norm, XenDesktop allows organizations to virtualize their desktops so that employees can work from anywhere and on any device that operates the most efficiently for the task at hand.
XenDesktop gives users access to a virtual PC at any time, from anywhere. With provisioning services, every virtualized desktop can be provisioned and re-provisioned in real time via a single shared disk image.
As a result, you can implement large-scale deployment via convenient, centralized image management. Not to mention, Citrix uses HDX which always optimizes the performance and quality of content transmission. In terms of flexibility, the options are impressive with cloud infrastructures such as Microsoft Azure and AWS available to end users.
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