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VirtualBox v4.2.12.84980 Portable

VirtualBox is a powerful x86 virtualization product for enterprise as well as home use. Not only is VirtualBox an extremely feature rich, high performance product for enterprise customers, it is also the only professional solution that is freely available as Open Source Software under the terms of the GNU General Public License (GPL). See "About VirtualBox" for an introduction.

Presently, VirtualBox runs on Windows, Linux, Macintosh and OpenSolaris hosts and supports a large number of guest operating systems including but not limited to Windows (NT 4.0, 2000, XP, Server 2003, Vista, Windows 7), DOS/Windows 3.x, Linux (2.4 and 2.6), Solaris and OpenSolaris, and OpenBSD.
VirtualBox is being actively developed with frequent releases and has an ever growing list of features, supported guest operating systems and platforms it runs on. VirtualBox is a community effort backed by a dedicated company: everyone is encouraged to contribute while Sun ensures the product always meets professional quality criteria.

Some of the features of VirtualBox are:
• Modularity. VirtualBox has an extremely modular design with well-defined internal programming interfaces and a client/server design. This makes it easy to control it from several interfaces at once: 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. VirtualBox 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 VirtualBox.
• Virtual machine descriptions in XML. The configuration settings of virtual machines are stored entirely in XML and are independent of the local machines. Virtual machine definitions can therefore easily be ported to other computers.
• Guest Additions for Windows and Linux. VirtualBox has special software that can be installed inside Windows and Linux virtual machines to improve performance and make integration much more seamless. Among the features provided by these Guest Additions are mouse pointer integration and arbitrary screen solutions (e.g. by resizing the guest window).
• Shared folders. 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 then be accessed from within virtual machines.

 VirtualBox 4.2.12 (release 2013-04-12)
This is a maintenance release. The following items were fixed and/or added:

    VMM: fixed a Guru Meditation on putting Linux guest CPU online if nested paging is disabled
    VMM: invalidate TLB entries even for non-present pages
    GUI: Multi-screen support: fixed a crash on visual-mode change
    GUI: Multi-screen support: disabled guest-screens should now remain disabled on visual-mode change
    GUI: Multi-screen support: handle host/guest screen plugging/unplugging in different visual-modes
    GUI: Multi-screen support: seamless mode: fixed a bug when empty seamless screens were represented by fullscreen windows
    GUI: Multi-screen support: each machine window in multi-screen configuration should have correct menu-bar now (Mac OS X hosts)
    GUI: Multi-screen support: machine window View menu should have correct content in seamless/fullscreen mode now (Mac OS X hosts)
    GUI: VM manager: vertical scroll-bars should be now updated on content/window resize
    GUI: VM settings: fixed crash on machine state-change event
    GUI: don't show warnings about enabled or disabled mouse integration if the VM was restored from a saved state
    Virtio-net: properly announce that the guest has to handle partial TCP checksums (bug #9380)
    Storage: Fixed incorrect alignment of VDI images causing disk size changes when using snapshots (bug #11597)
    Audio: fixed broken ALSA & PulseAudio on some Linux hosts due to invalid symbol resolution (bug #11615)
    PS/2 keyboard: re-apply keyboard repeat delay and rate after a VM was restored from a saved state (bug #10933)
    BIOS: updated DMI processor information table (type 4): corrected L1 & L2 cache table handles
    Timekeeping: fix several issues which can lead to incorrect time, Solaris guests sporadically showed time going briefly back to Jan 1 1970
    Main/Metrics: disk metrics are collected properly when software RAID, symbolic links or rootfs are used on Linux hosts
    VBoxManage: don't stay paused after a snapshot was created and the VM was running before
    VBoxManage: introduced controlvm nicpromisc (bug #11423)
    VBoxManage: don't crash on controlvm guestmemoryballoon if the VM isn't running (bug #11639)
    VBoxHeadless: don't filter guest property events as this would affect all clients (bug #11644)
    Guest control: prevent double CR in the output generated by guest commands and do NLS conversion
    Linux hosts / guests: fixed build errors on Linux 3.5 and newer kernels if the CONFIG_UIDGID_STRICT_TYPE_CHECKS config option is enabled (bug #11664)
    Linux Additions: handle fall-back to VESA driver on RedHat-based guests if vboxvideo cannot be loaded
    Linux Additions: RHEL/OEL/CentOS 6.4 compile fix (bug #11586)
    Linux Additions: Debian Linux kernel 3.2.0-4 (3.2.39) compile fix (bug #11634)
    Linux Additions: added auto-logon support for Linux guests using LightDM as the display manager
    Windows Additions: Support for multimonitor. Dynamic enable/disable of secondary virtual monitors. Support for XPDM/WDDM based guests
    X11 Additions: support X.Org Server 1.14 (bug #11609) 

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