Intel PXE boots ROM with support for the E1000 network card allows you to remotely boot a computer trough emulation.
VirtualBox Remote Desktop Protocol (VDRP) support allows you to run a virtual machine on one PC, while you can view and control it from another. To use it you'll have to enable the controller by hand and add filters for USB devices that you want to use this controller. The current extension pack includes a USB 2.0 (EHCI) controller that allows you to get better performance from your USB 2.0 devices.
To install it just close down any running Virtual Box instances and double-click on extension pack file and the tool will launch and install it for you, upgrading any earlier version of extension pack you might have. The packs have a 'vbox-extpack' file extension that's automatically handled by VirtualBox. Using the extension pack doesn't require a separate installation. VirtualBox Extension Pack was introduced in Virtualbox as a new way to extend the functionality of the VirtualBox base package.
