Improved Video Support - The guest additions provide improved video performance and a greater range of video modes and resolutions.Instead, the focus will switch automatically between the guest and host as the pointer travels in and out of the virtual machine window. With guest additions installed, it is no longer necessary to click in the virtual machine window to establish focus and press the host key to release focus. Mouse Pointer Enhancements - Without the guest additions installed, clicking in a virtual machine window captures the mouse focus and locks it into the window until the host key (the right hand Ctrl key by default) is pressed.Automated Windows Logon - Guest additions allow Windows login credentials to be stored in a master repository and used to automatically log into one or more Windows guests.Control over clipboard access is controlled via the VirtualBox preferences settings, details of which can be found in the Configuring the VirtualBox Environment chapter. Shared Clipboard - Allows the guest and host operating systems to access each others cut and paste clipboards enabling easy transfer of text and objects between the two environments.This topic is covered in more detail in the VirtualBox Shared Folders chapter.

Shared Folders - Provides the ability to make folders/directories on the host file system available to guest operating systems running inside VirtualBox virtual machines.

Seamless Window Support - One of the most compelling features of VirtualBox, seamless windows allow the window of an application running on the desktop of a guest operating system to be placed on the desktop of the host operating system such that it appears to be running directly on the host rather than within a virtual machine.

Host/Guest Time Synchronization - Ensures that the system times of the guest and host are synchronized at regular intervals thereby preventing the virtualization time drift often encountered with guest operating systems running in virtual machines.

When installed on a guest operating system, VirtualBox Guest Additions provide the following enhancements:

9 Updating the Linux VirtualBox Guest Additions.

8 Recompiling the Linux Guest Addition Kernel Modules.

7 Selected Installation of Linux Guest Additions.

6 Installing VirtualBox Guest Addition on Linux.

5 Manually Extracting the VirtualBox Windows Drivers.4 Installing VirtualBox Guest Additions on Windows.3 The VirtualBox Guest Additions ISO File.

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