Extend Boot Volume

In "Windows 7 In Depth", discussing Disk Management (page 718), the authors say:

Caution: If you shrink your system's boot volume, you cannot extend it (unless you want to connect your system's hard disk to another system running Windows 7).

Is this true? If so, it seems rather an oversight. Has anyone tried it? The book might be referring to Dynamic Disks, or Basic Disks, or both, I cannot tell.

I have never encountered this problem...

~Lordbob

Hmm, just found this:
http://technet.microsoft.com/en-us/l.../cc771473.aspx

So perhaps the authors meant "You cannot extend the current system or boot partitions using Microsoft's own tools."