Hello,what you to know xen server , xen desktop . for your information I'm an IT expert with more than 15 years of experience in the IT industry . I'm Cisco Certified networking professional 300-100 and 300-115 and Linux Certified Professional lpi 101, 102 and red hat certified system administrator and VMware Certified Professional 4, 5,5.5 and Data Center and Microsoft System administrateur /Engineer ranging from 2003 to 2012 .