"Linux is a computer operating system, like Windows."
"Linux is an OS, but the code for it is open source, meaning it is available to anyone and can be manipulated by any user."
Exactly what the name says: It displays and sets the date on a Linux system.
http://knoppix.net/linux-certification.php - here you can find exactly what you search and you can learn everything about Linux certification.
Most Linux OS's walk you through dual booting. Choose your prefered Linux OS and burn it to a disc and run it. You could also partition your hard drive from the XP side and create a space for your Linux OS to run in. If you are new to Linux, it is recomended to run the OS without actually installing it, that way you can get the feel of Linux without completely installing it.
Not exactly clean what do you mean.1. Which directory are you in: pwd2. Your PATH environment variable: echo $PATH
Most screensavers on Linux are modules run by Xscreensaver: http://en.wikipedia.org/wiki/XScreenSaver I don't know exactly how to convert a program to a module, check the Xscreensaver documentation.
Chances are you can find exactly what you are looking for by looking on the website craigslist or ebay. There are many companies and businesses renting systems with Linux distros already preloaded.
Exactly the same thing DHCP (Dynamic Host Control Protocol) provides for any other operating system administrator.Most, if not all, Linux distros come with a dhcp client in the basic installation.
Your question is worded very poorly, so it is difficult to determine exactly what you are asking. After you log into Ubuntu, the desktop appears.
Linux Internals is a book about how Linux works.
Linux World is the Linux Development & Training Center
The courses available for Linux include Linux server, Linux desktop, bash shell, and many others.
One can obtain the latest Linux news on websites such as CRN, Linux Today or Distro Watch. One can also find news about Linux on Arch Linux and Linux Journal.