I got this from a fella in work known as the Legend or the LegEnd. Not sure which.
But, thanks to him I was able to dig out the service tag of my laptop without getting someone to read th ebios or look at the serial number on the bottom.
Go into the command prompt. and type this:
wmic bios get serialnumber
It will return the code for you so you can use it on the Dell website to get support.
Very nice to have.