Installing CItrix VDA Agent on Server OS

on this EE site, I was trying to understand the layout of Xenapp/Xendesktop 7.6 in comparison with Xenapp6.5 version and previous ones.

I posted this question below, I got answers, but the thread was too long and the answer from Carl was clear, though I did not want to ask for citrix link for confirmation

Well, in Xenapp 6.5 version and previous ones , we used to install Xenapp server then install applications on the Xenapp server and publish the applications to end users.

Now, as I have been told, we do that either on Xendesktop7.6 or Xenapp7.6:
1- Create Machine catalog and select Windows Server OS to install on the Machine you are delivering, install VDAgent on Windows Server you are delivering.
2- Create Delivery Group, and install Applications on the Windows Server OS you have installed on "Create Machine Catalog" step 1, then select the Active directory user groups that will have access to the published applications.

I have been told that when you install VDA agent as indicated on step 1, the server you are delivering will automatically become Xenapp server. It sounds good, but I need Citrix Link that confirms that.
Knowing that Xenapp7.6 or Xendesktop 7.6 is already installed through DVD at the first place, then why not just using the existing Xenapp7.6 or Xendesktop7.6 to install Applications on it then publish(Deliver) them to end users ?

Any clarification will be helpful

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Carl WebsterCitrix Technology Professional - FellowCommented:
When Citrix made the change from the old IMA architecture to the new FMA architecture, Citrix moved to installing Virtual Delivery Agents (VDA) instead of installing a full server software stack that made a server a XenApp 5.x/6.x server.

When you install the VDA on a supported Server OS, the VDA will install the Remote Desktop Services role which is what is needed to support multiple users and that makes the server a XenApp server.

Have you even tested this in a lab? Try it. See for yourself. The new way is MUCH better than the old way.

This really is not that hard to understand or work with.
Carl WebsterCitrix Technology Professional - FellowCommented:

Virtual Delivery Agent (VDA) — The VDA is installed on each physical or virtual machine in your Site that you want to make available to users. It enables the machine to register with the Controller, which in turn allows the machine and the resources it is hosting to be made available to users. VDAs establish and manage the connection between the machine and the user device, verify that a Citrix license is available for the user or session, and apply whatever policies have been configured for the session. The VDA communicates session information to the Broker Service in the Controller through the broker agent included in the VDA.

XenApp and XenDesktop include VDAs for Windows server and desktop operating systems. VDAs for Windows server operating systems allow multiple users to connect to the server at one time. VDAs for Windows desktops allow only one user to connect to the desktop at a time.

Machine catalogs

Machine catalogs are collections of virtual or physical machines that you manage as a single entity. These machines, and the application or virtual desktops on them, are the resources you want to provide to your users. All the machines in a machine catalog have the same operating system and the same VDA installed. They also have the same applications or virtual desktops available on them. Typically, you create a master image and use it to create identical virtual machines in the catalog.

When you create a machine catalog, you specify the type of machine and provisioning method for the machines in that catalog.

Machine types

•Windows Server OS machines — Virtual or physical machines based on a Windows server operating system used for delivering XenApp published apps, also known as server-based hosted applications, and XenApp published desktops, also known as server-hosted desktops. These machines allow multiple users to connect to them at one time.

•Desktop OS machines — Virtual or physical machines based on a Windows desktop operating system used for delivering VDI desktops (desktops running Window desktop operating systems that can be fully personalized, depending on the options you choose), and VM-hosted apps (applications from desktop operating systems) and hosted physical desktops. Only one user at a time can connect each of these desktops.

Below this is a table of the differences between XenApp 6.5 and 7.6.

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jskfanAuthor Commented:
So VDAgent if it is installed on WIndows Server , the server will function as Xenapp.
If VDAgent is installed on Windows client for instance Win7,Win8,etc...., it will serve as VDI
Carl WebsterCitrix Technology Professional - FellowCommented:
to confuse you more, there is one more scenario called server vdi. that can only be done from a command line install.
jskfanAuthor Commented:
Thank you for the explanation
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