I have no idea how many times a week or month I talk about RDC (it's lots!), so it's always great to see in depth documents for those who wish to take a deep dive into the technology.  So here is 15-16 pages of very detailed information - you have been warned!

RDC or Remote Differential Compression (which is leveraged by DFS-R) was introduced in Windows Server 2003 R2 and will be in Windows "Longhorn".

Have fun...