How can I install SP1 via domain policy

From: Alberto (albertocoralli@hotmail.com)
Date: 09/23/02 

From: "Alberto" <albertocoralli@hotmail.com>
Date: Mon, 23 Sep 2002 02:32:55 -0700

I'm gonna install SP1 on 80 clients here in my company
using domain policy but I'm wondering how can I install
the software package (update.msi) customizing parameters,
I mean I wanna install the SP1 without backup files.
Any suggestion?

thanks

Alberto