Service tag can be obtained from DMI:
As for support URL, it's not stored on the system.
On 05/17/2010 10:59 AM, Sebastien Bacher wrote:
> could you give details on what "service tag" and "support url" are, when
> they should be displayed and from where they should get their
> ** Changed in: gnome-system-monitor (Ubuntu)
> Status: New => Incomplete
*Dell* | OS Engineering