Application Groups is a new feature introduced in XenApp and XenDesktop 7.9 (speaking of which: XenApp and XenDesktop are the same thing just that different functionality is exposed based on the license. I kind of knew this, but thanks to proper testing by James Rankin as shown in his YouTube video I can now say this with confidence). I’d thought of writing a blog post on this but (a) I am lazy and (b) this blog post from Citrix explains it much better. Take note of the example they give with beta testers – that’s just what I do in my environment too.
Machine Catalogs contain your machines. Delivery Groups target a subset (or entirety) of the machines in a Machine Catalog. Delivery Groups can contain machines from multiple Machine Catalogs but a single machine can only be a member of one Delivery Group.
Typically you’d create Machine Catalogs and assign machines from these to a Delivery Group. Then you’d define applications in the Delivery Group and assign users who can access them. When you use Application Groups, however, you continue to assign users in Delivery Groups but now you associate the Application Group with one or more Delivery Groups and define applications in the Application Group. You can set priorities for the Delivery Groups within an Application Group, and if an application is present in more than one Delivery Group (and the user launching the application has permissions to these Delivery Groups) then it is launched from the Delivery Group with the higher priority (a lower number has higher priority).
Once we start using Application Groups there’s no need to define applications in Delivery Groups.
Application Groups also help in targeting specific machines in a Delivery Group. As I mentioned above a Delivery Group can contain machines from multiple Catalogs. Using Application Groups its possible that some users are “pinned” to applications from machines in specific Machine Catalogs.
Here are more links on how Application Groups can be used along with tags:
- Directing Citrix XenApp 6.5 or 7.x users to run their applications on specific servers (using Load Balancing Policies, or Tags)
- Desktop and Application restrictions using tags
- How to assign applications and desktops to specific servers in XenApp 7.12 (YouTube video)