Help with Portable Home Directories from Windows

Setup: Tiger Server 10.4.11 Everything is setup up perfectly and all Mac users can login and use their portable home directories. Everything works great. Here's my question: Is it possible to replicate the same behavior when logging in from Windows XP? I setup a test user (WINUSER) and pointed him to the same share I use for the Mac home directories. How do I set it up so that when I log in with this user from Windows XP, that Windows XP creates a local account and syncs it with the Mac OS X server (the same way that the Mac laptops do it). Any help would be greatly appreciated. Thanks