Anybody got the DhcpGlobalForceBroadcastFlag key working on Windows 7 ?

( I know this may look like a Windows 7 question, but it is also Infrastructure related and I think DHCP server guys are the most likely to know the anwser.)

I'm try to set it for en ethernet card, like this :

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Dhcp\Parameters\DhcpGlobalForceBroadcastFlag\14]

"0"=dword:00000001

When I check with Network Monitor the broadcast flag is not set to 1.

I've try the DhcpConnForceBroadcastFlag method and it works like a charm. But I want to set the Broadcast Flag to 1 for all the computers here on any ethernet card (I don't want to have to gess the GUID of the interface on each computer).

Note : I followed the instructions from http://blogs.technet.com/b/teamdhcp/archive/2009/02/12/dhcp-broadcast-flag-handling-in-windows-7.aspx