The article provides information about the policy settings available with XenApp versions 6 or later, and XenDesktop versions 5 or later.
Starting with XenApp 6 and XenDesktop 5, policies configure many User and Machine based settings. This reference can assist in planning and troubleshooting policies in XenApp and XenDesktop deployments.
XenApp 6.5 Policy Settings Reference
Citrix Documentation - Policies.