How printing works in Citrix XenApp 7

I want to understand how printing works in citrix Xenapp 7, but before we put Citrix in the picture, I need to understand how printing works in Windows.
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Let's say I have Windows 7  and Windows 2008 Print Server that already has Print queues and drivers on it.
From Windows 7, I can use Add printer wizard and point it to \\Win2008PrntSvr\PrntQueuename1 , this will add the printer to Windows 7 and download the drivers.
Now if I open MSWord and print a Document , would Windows 7 make any communication to Windows 2008 Print server for any reason or it just send the document to the print device specified in the print queue Port, without any communication to WIndows 2008 Print Server ?
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Now let's put Citrix Xenapp in the picture.
If I understand there is no need for Drivers to be installed in Xenapp server, just to enable a policy related to Universal Print Drivers.

In this case when Windows 7 connects to Citrix opens up an Application from Citrix and print a document.
Is Citrix going to make any communication with Windows 2008 print server ?

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It seems to me like Windows 2008 print server is used only the first time by Windows 7 client to download the drivers and the printer configuration such as the hostname of the print device and its print settings, then the client will not communicate with Windows print server at all.

Any clarifications on this topic will be very much appreciated.

Thanks