XenApp 6.5 and RDS Licenses

Hello all.  Hoping you can clear something up for me.  Am I correct in assuming that you are to have RDS user CALs to match your Citrix XenApp user CALs in a production environment?  This means that the RDS licensing role needs to be install and the license are installed there.  Each of the Citrix servers are configured to use this RDS licensing server for licensing.

I ask because I've just come back from a week long XenApp training course which says, yes RDS licensing is required for Citrix to function.  However, I am working in an environment now that has been up and running for about a year and through the process of troubleshooting a "concurrent user" error find that the RDS licensing server has no installed licenses.  Trying to figure out how licensing works at all right now for this client given that the 120 day grace period would have expired long ago.  Thanks for clearing this up.
4roiAsked:
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basrajCommented:
For XenApp you need both RDS CAL licenses (user or device based) as well as XenApp licenses( often concurrent license will be used). First check you have appropriate RDS CAL licenses installed on your RDS licenses server. After that you need to point each terminal server(nothing but xenapp servers) to rds server and also point it to XenAPp license server.
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
XenApp relies on Terminal Service / Remote Desktop Services.  Each XenApp connection will require a RDS CAL.  Check link below:

http://technet.microsoft.com/en-us/library/cc737644(v=ws.10).aspx
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4roiAuthor Commented:
Ya, I hear everyone.  Thanks for confirming.  Trying to figure out how this production environment of 40+ users even works without any RDS CALs...  Scary.
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basrajCommented:
Use this link to find how your terminal servers are licensed:

http://technet.microsoft.com/en-us/library/cc756749(v=ws.10).aspx
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Carl WebsterCitrix Technology Professional - FellowCommented:
They will work for 120 days without a RDS License Server being installed.  On day 121, everything will come to a screeching halt.
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4roiAuthor Commented:
So I didn't really see a precise answer here.  After going through my Citrix Certified Admin test, I did come across the "rules" as it were to RDS and Citrix XenApp CALs.

Microsoft doesn't care about concurrent connections when it comes to RDS User CALs.  For example, if you have 3 shifts of 10 users, you need 30 RDS User CALs even though 10 users are accessing the system at any given time.

RDS device CALs are somewhat different as I imagine you only need to purchase licenses for each piece of equipment used to connect to the RDS environment.

XenApp licenses are concurrent.  So for the example of having 3 shifts of 10 users.  you would need 30 RDS CALs, but only 10 XenApp CALs.

Why is this NOT documented better!!! Ah!  ;)
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4roiAuthor Commented:
Answered my own question from my own research and testing experience.
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