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4 Guest Additions
For Linux and Solaris guests, the Xorg server version 1.3 or later is required for
automatic resizing (the feature has been disabled on Fedora 9 guests due to a
bug in the X server they supply). The server version can be checked with Xorg
-version.
Finally, if the Guest Additions are installed, 3D graphics for guest applications
can be accelerated; see chapter 4.8, Hardware 3D acceleration (OpenGL and Di-
rectX 8/9), page 71.
Time synchronization With the Guest Additions installed, VirtualBox can ensure that
the guest’s system time is better synchronized. This fixes the problem that an
operating system normally expects to have 100% of a computer’s time for itself
without interference, which is no longer the case when your VM runs together
with your host operating system and possibly other applications on your host. As
a result, your guest operating system’s timing will soon be off significantly. The
Guest Additions will re-synchronize the time regularly.
Shared folders These provide an easy way to exchange files between the host and
the guest. Much like ordinary Windows network shares, you can tell VirtualBox
to treat a certain host directory as a shared folder, and VirtualBox will make it
available to the guest operating system as a network share. For details, please
refer to chapter 4.6, Folder sharing, page 68.
Seamless windows With this feature, the individual windows that are displayed on
the desktop of the virtual machine can be mapped on the host’s desktop, as if
the underlying application was actually running on the host. See chapter 4.7,
Seamless windows, page 70 for details.
Shared clipboard With the Guest Additions installed, the clipboard of the guest op-
erating system can optionally be shared with your host operating system; see
chapter 3.7.1, General settings, page 46.
Automated Windows logons (Credentials passing; Windows guests only) For de-
tails, please see chapter 9.2, Automated Windows guest logons (VBoxGINA), page
128.
4.2 Windows Guest Additions
The VirtualBox Windows Guest Additions are designed to be installed in a virtual
machine running a Windows operating system. The following versions of Windows
guests are supported:
• Microsoft Windows NT 4.0 (any service pack)
• Microsoft Windows 2000 (any service pack)
• Microsoft Windows XP (any service pack)
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