Question : Service Tag

When we rolled out our Dell desktops, we changed the Computer Name (though My computer ,. properties , computer name) Now, I'm in a situation where I need to get the Service Tag of the computers. I don't want the name that I've assigned but the real Service Tag  I can see it when I F2 when booting. That's the one I want ..usually it looks like 2NR1Y1S.

How can I use a VB Script or WMIC to get this info remotely

Thanks
Cheers

Answer : Service Tag

I should have been more clear ... the Express Service Code cannot be pulled from a WMI query.  If you pull the whole WMI BIOS string (wmic bios), the ESC is not in there at all.  I don't think there is any way to pull that information out, as even the BIOS update packages check the version through WMI.

All Dell computers have a Service Tag and a corresponding Express Service Code.  In fact, nearly all computers have a Serial Number stored in the BIOS and the wmic bios get serialnumber will return that regardless of make.  

As for why it is not returning a Service Tag for all of them ... Is the query returning a blank result? or is the query not running or giving an error?  Will it return the ST if run locally? or is it just not returning anything when run remotely?  I have noticed that it sometimes will not run remotely in a workgroup, and it will not return anything if the motherboard was replaced and the ST not set in the BIOS on the replacement, and I believe WMI can be shutoff or given restricted permissions.  What OS version/SP do you have installed on them?  x86/x64?  If different, is there a pattern?