Change the taskbar settings programmatically?

Question

I want to change the settings of my taskbar with a small batch file or java programm or whatever.
So I want to know, if there is a registry key containg this information.

Does anybody knows, where Windows sets taskbar settings?

Edit: No, I don't want to annoy the users with changing taskbar settings on every boot.

Answer 1

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\

and 64 bit eqivalent?