Multicast Windows 7

I am using DS 6.9 sp6 to run imagex and deploy my Windows 7 images from a wim file.  We start by running diskpart to create the typical 100MB partition and use the remaning disk space for the OS, which is eventually the C: drive.  This process work wonderfully for deploying the image straight from the DS server.  However, what I need to be able to do is follow that process and multicast to machines in a given room/lab.  The first few attempts, which were abandoned long ago did not work.  Does anyone have a multicast Win 7 process that works?  What is it?

Thanks in advance!

Peter