Connect remotely to the Dell computer.
Navigate to the “Start” menu and select “Run.”
In the Run dialog, type “cmd” (without quotes) and click “OK.”
Type “wmic bios get serialnumber” (without quotes). Press “Enter.”
C:\Documents and Settings\User>wmic bios get serialnumber
SerialNumber
5LMY1D1
The computer responds with information from the Dell remote computer. The information below “Serial Number” is the Dell system service tag.
To obtain the make and model number, type “wmic csproduct get vendor,name,identifyingnumber” (without quotes). Press “Enter.”