With this unique feature, a virtual machine that acts as an RDP server can still access arbitrary USB devices connected to the RDP client. A virtual machine can act as an RDP server, allowing you to 'run' the virtual machine remotely on some thin client that merely displays the RDP data. It fully supports the standard Remote Desktop Protocol (RDP), unlike any other virtualization software. It implements a virtual USB controller and allows you to connect arbitrary USB devices to your virtual machines without installing device-specific drivers on the host. Some extra features are available with the full VirtualBox release only. Like many other virtualization solutions, for easy data exchange between hosts and guests, VirtualBox allows for declaring certain host directories as 'shared folders,' which can be accessed from within virtual machines. Among the features of these Guest Additions are mouse pointer integration and arbitrary screen solutions (e.g., resizing the guest window). It has special software installed inside Windows and Linux virtual machines to improve performance and make integration seamless.

Guest Additions for Windows and Linux.

Virtual machine definitions can, therefore, easily be ported to other computers. The configuration settings of virtual machines are stored entirely in XML and are independent of the local machines. It also comes with a full Software Development Kit: even though it is Open Source Software, you don't have to hack the source to write a new interface. For example, you can start a virtual machine in a typical virtual machine GUI and then control that machine from the command line or possibly remotely. This feature makes it easy to control it from several interfaces at once. It has an extremely modular design with well-defined internal programming interfaces and a client/server design. Targeted at server, desktop, and embedded use, it is now the only professional-quality virtualization solution and Open Source Software. VirtualBox Extension Pack is also available. VirtualBox is a free virtualizer that extends your existing computer's capabilities so that it can run multiple operating systems in virtual machines at the same time.

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