## VDI Agent Technology Before adding a server as a VDI host to a Parallels RAS site, you need to install a hypervisor on it. Parallels Remote Application Server supports VDI hosts based on the following virtualization technologies: VMware ESXi VMware VCenter Microsoft Hyper-V Microsoft Hyper-V Failover Cluster Citrix XenServer This section describes how to: Prepare Citrix XenServer for Parallels RAS Prepare Hyper-V for Parallels RAS Prepare VMware vSphere for Parallels RAS