I don't know about other systems but on my dimension 4300 the tag no. is under the flap on the front panel.

Hope this helps.

You mean the Service Tag and the Express Service Code ?

They should be on a label on the side of your Dell system.

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DELL Dimension L733r
192 MB RAM
20 GB HD
8x4x32x LG CDRW
56k Voice/Fax Modem
Motorola SB4100 Cable Modem (USB)
OS : W98SE