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Desktop Virtualization Glossary

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Connection Broker - in VDI, a software/hardware solution for virtual machines management, network connection and session tracking, access rights management.

Desktop Virtualization - using virtual machines and relevant solutions to serve a number of desktop environment needs: running multiple OS simultaneously on the same hardware, hosting multiple virtual desktop environments on a single server, improve high availability of desktop environment by hosting virtual desktops in datacentre with failover capabilities between servers, maintain secure access and simplify management of multiple desktop environments.

VDI - Virtual Desktop Infrastructure, where users access their virtual desktop environments hosted on servers in datacentre. Usually, a connection broker for managing client's connections and routing them to relevant virtual environments is part of VDI.

VM - Virtual Machine

Xen - a free software virtualization solution for IA-32, x86-64, IA-64 and PowerPC 970 architectures. A software layer called Xen hypervisor is used to manage virtual environments with guest operating systems. Hypervisor is the only layer which directly accesses all the CPUs and available memory. Guest operating systems are installed in separate virtual environments called user domains (domU's), all of which are provided shares of CPU time and memory allocation through Xen hypervisor.  More info: Xen @ Wikipedia.

xVM (Sun/Solaris xVM) - an open-source virtualization solution from Sun Microsystems based on Xen hypervisor (requirest Intel-VT or AMD-V hardware assisted virtualization for best results). xVM became first available in OpenSolaris.