force DHCP renewal

I made a change to our DHCP scope that I want to apply ASAP.  What's the best way to force the clients to renew thier DHCP address?  I'm using MS 2003 Server for the DHCP with Active Directory.
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Delphineous SilverwingGood Ol' GeekCommented:
Address renewal is a client-side operation that cannot be forced from the server.  Other than the standard renewal cycle, machines will usually only automatically renew when turned on.  The Circuit Breaker Panel can help with this.

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Depending on how many clients you have you can either bring up a command prompt on each one and type ipconfig /renew or you can send an email to your users asking them to reboot their computers. Either way will work.
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