Dell computers use a system identification system called a "Service Tag" to mark your specific system so that you can find the drivers you need and access the support necessary for the exact computer you are using. According to Dell: "Your Service Tag is a unique five- to seven- digit alphanumeric (letter and number) code, which is found on a white bar-coded label affixed to your Dell computer or peripheral."
Find your service tag automatically by using Dell's Web-based software. Follow the link in the resources section of this article to launch the Dell service tag finder (note: it only works in Internet Explorer). Allow the software to install on your system and it will find the service tag for you.
Look for the service tag sticker on your Dell device. Often it will be located on the back or bottom of the unit. The tag will have two numbers, the service tag and the "express service code" which is the same information encoded numerically for entry via telephone or bar code scanner.
Download the Dell E-Support tool if you need to identify the service tags on computers without Internet access and no stickers are no longer in place. You can find a link to the Dell E-Support program in the resources section of this article. Run the E-Support tool on any Dell computer to find the service tag and additional troubleshooting information.