VirtualBox comes with the seamless mode option that can be enabled from the machine menu in a guest OS. If Microsoft Windows is the guest OS, and seamless mode is enabled, you will see the Windows taskbar above your Gnome or KDE task bar. You will not see the Windows desktop. Anything you run from the Windows taskbar will be in a window directly on your Linux desktop.
Seamless mode is for all practical purposes seamless. All your guest OS application are not run on a separate window, they are run in their own independent windows on the host OS desktop. It is truly a seamless blending of two operating system.
To enbale seamless mode with a hotkey, press your globally defined hotkey and “L”.
Take seamless mode to the next level (screenshot available)
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Setting auto user login on KDEÂ is a little different than Gnome. On KDE go to your K menu and click system settings. Then click advanced, then click Login Manager. At the bottom right is the “administrator mode” button, click it and punch in your root password. Click the convenience tab. Check the box that says “enable auto login”, bam 
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In gnome you would go to your administration tab, and the users manager; but in KDE is a little different. First go to your KDE button, then system settings. Then click users management. Then click the button at the bottom right corner that says administrator mode. Then to add a user to a group click the groups tab. Select the group that you want to add a user to, and click modify. You will be able to add users to the group now.
Overall the process of graphical User Management is a little different on KDE as compared to Gnome. A user comfortable with Gnome will definitely be thrown off at first.
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For a year now I have been using a Gnome desktop environment. KDE is now in place and I’m finding it refreshing. Its mouse events trigger slightly different, and KDE seems to operate with increased performance on my particular HP DV2000 hardware. My favorite KDE applet it kpowersave; it allows for easy frequency scaling. I also like the look and feel of knetwork manager as compared to network manger for gnome. Overall KDE has a increasingly glass like interface and a luxurious overtone.
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The instant transfer of the cursor between the host environment and the guest is a crucial component of a seamless guest operating system. Mandriva apparently comes pre-installed with VirtualBox compatible code, as the behavior of the mouse is consistent with that of a successfully installed VirtualBox guest additions package.
I have a high opinion of Mandriva. The installation process is unique, simple, intuitive, and fast. The size of the OS is relatively small considering it utilizes a KDE desktop. Three thumbs up
I added a Mandriva VirtualBox VDI to those available on VirtLinux.com
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If your running Ubuntu Server Edition you can install a KDE or Gnome graphical desktop with a couple of apt installation. For a bare minimal install, you will be able to login to a full desktop with one of the following:
sudo apt-get install gnome-core
sudo apt-get install kde-core
For a baseline set of package you can install the following:
sudo apt-get install gnome
sudo apt-get install kde
For the entire package set released with either Kubuntu or Ubuntu you can install:
sudo apt-get install ubuntu-desktop
sudo apt-get install kubuntu-dekstop
These commands will install all the files associated with the default graphical desktop that comes with either Ubuntu or Kubuntu.
So, what can be done is a Ubuntu server installation, and if need be, you can install the graphical environment. Overall I do like installing the core packages, so that once I get the desktop running, I can install specifically the package that I use. You can refer to a previous post of mine for more information about typical KDE packages on a core KDE desktop:
http://www.bgevolution.com/blog/index.php/gnome-kde-ubuntu-kubuntu-desktop-config/
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Keyboard Shortcuts allow for media buttons, such as start, stop, play, volume up, volume down, mute, and others to perform as expected after configuration. In Debian, the out-of-the-box install has in the Preferences folder the Keyboard Shortcuts manager. Its relatively intuitive, you click the action you want, such as volume up or down, then you press the corresponding media button to establish the association.
On KDE go to your settings, Control Center, Regional & Accessibility, Keyboard Shortcuts. This menu appears different than the other Keyboard Shortcuts manager, but it will do exactly the same thing. Also on KDE, you can install kmix, and this program will manage specifically your volume media button shortcuts
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