Recommended Installation Sequence for XenDesktop 4 Hotfixes http://support.citrix.com/article/CTX128604
User Profiles for XenApp and XenDesktop http://support.citrix.com/article/CTX124799
Virtual Desktop Agent and Desktop Delivery Controller Troubleshooting http://support.citrix.com/article/CTX124581
Delegated Administration and Configuration Logging Components – For XenDesktop 4 SP1 http://support.citrix.com/article/CTX126122
Citrix released the first Service Pack for XenDesktop 4. It is recommended to update XD4 environments with the SP1. . . . → Read More: XenDesktop 4 Maintenance