The XenApp 6.5 OpenGL GPU Sharing Feature Add-on is available for download fromhttp://www.citrix.com/downloads.
Select Product > XenApp and Download Type > Components, then select the XenApp 6.5 OpenGL GPU Sharing Feature Add-on.
The Support Forum for this feature add-on is athttp://forums.citrix.com/forum.jspa?forumID=1602.
Source: http://support.citrix.com/proddocs/topic/xenapp65-admin/hd-opengl-gpu-sharing.html
