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VirtualBox 4.2.0 RC1

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VirtualBox 4.2.0 RC1  Change Log

# The following major new features were added:
* Improved Windows 8 support, in particular many 3D-related fixes
* GUI: VM groups
* GUI: expert mode for wizards
* GUI: allow to alter some settings during runtime
* Support for up to 36 network cards, in combination with an ICH9 chipset configuration
* Resource control: added support for limiting network IO bandwidth; see Section 6.9, “Limiting bandwidth for network I/O”
* Added possibility to start VMs during system boot on Linux, OS X and Solaris; see Section 9.24, “Starting virtual machines during system boot”
* Added experimental support for Drag'n'drop from the host to Linux guests. Support for more guests and for guest-to-host is planned.
* Added support for Host parallel port passthrough on Windows platform
# In addition, the following items were fixed and/or added:
* Mac OS X hosts: sign application and installer to avoid warnings on Mountain Lion
* VMM: improved VM context switch performance for Intel CPUs using nested paging
* VMM: added support for FlushByASID features of AMD CPUs (Bulldozer and newer)
* VMM: fixed unreal mode handling on older CPUs with VT-x (gPXE, Solaris 7/8/9)
* VMM: fixed MP tables fixes for I/O APIC interrupt routing relevant for ancient SMP guests (e.g. old OS/2 releases)
* VMM: support recent VIA CPUs
* GUI: network operations manager
* GUI: allow taking screenshots of the current VM window content
* GUI: allow automatically sorting of the VM list
* GUI: allow starting of headless VMs from the GUI
* GUI: allow reset, shutdown and poweroff from the Manager window
* GUI: allow to globally limit the maximum screen resolution for guests
* GUI: show the full medium part on hovering the list of recently used ISO images
* GUI: do not create additional folders when a new machine has a separator character in its name
* GUI: don't crash on terminate if the settings dialog is still open
* Snapshots: fixed a crash when restoring an old snapshot when powering off a VM
* Settings: sanitise the name of VM folders and settings file
* Settings: allow to store the iSCSI initiator secret encrypted
* E1000: 802.1q VLAN support
* Storage: implemented burning of audio CDs in passthrough mode
* Storage: implemented support for discarding unused image blocks through TRIM for SATA and IDE and UNMAP for SCSI when using VDI images
* Storage: added support for QED images
* Storage: added support for QCOW (full support for v1 and readonly support for v2 images)
* Storage: added readonly support for VHDX images
* Solaris additions: added support for Server 1.11 and 1.12
* Windows hosts: no need to recreate host-only adapters after a VirtualBox update
* Windows hosts: updated toolchain; make the source code compatible to VC 2010 and enable some security-related compiler options

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