DHCP Registration

Forgive me if this is a dumb question or one that's been answered
previously. Is there a way to configure Windows DHCP, using the API, so
that you could force clients to register their MAC address before recieving
an IP that would be routable?? I work with Novell's IDM and have found a way
to integrate Perl scripts with the ISC DHCP server so that you could assign
an "Unknown Host" an IP that would be in a special VLAN and all traffic
would be routable to a single IP (the registration server). Once registered
the workstation would receive an appropriate IP from the VLAN scope for
their department or location. I have seen the MACFilterCallout DLL but that
requires a service restart when the list is updated. I need something more
dynamic and if it's possible I can utilize powershell or VBScripts to handle
the integration.

Any help is appreciated!!


JK