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You can download a Dell System Utility package that has the Asset.com file for setting the tag ID in BIOS. This file can be downloaded here.
Started using this resently to autocapture the service tags as we put new systems on our network via a MSIF driven unattended process. Developed the script below to capture/isolate the service tag into a variable for later conditional processing, and thought others might find this useful. Script assumes Dos 6.22. Requires change.exe from/complements of MSIF process.
<< SERVCTAG.BAT >>
::Gets Dell Service Tag into Variable
:: Blame Mont McCathern
asset |find "Service" >get.bat
change get.bat Service Set
type get.bat |find "Set" >settag.bat
FOR %%a in (*.) do SET SERVCTAG=%%a
echo set SERVCTAG=%SERVCTAG% >>a:\temp\vars.bat