No, not true, but for best performance you would use Windows natively, through a Boot Camp install.
So, a variety of choices.
Boot Camp, which you can only use Windows XP SP2 or a later Windows version.
Parallels, which supports installing around 3 dozen different guest operating systems, including just about every version of Windows or Linux, plus a few others. You don't boot into the operating system, but you run that guest OS while Parallels is open. It's a form of virtualized software, along with the third major choice - VMWare Fusion, which is similar to Parallels in a lot of ways.
Windows is quite nice on any of the above (Intel only) solutions.
But, you asked about powerbook/MacBook - and, of course, none of this applies to a Powerbook, which can't run Parallels, or any form of Windows without some heavy-duty software like VirtualPC, which does not give you anything approaching good performance from Windows (on a PowerPC processor, anyway).
These alternatives were also mentioned in the thread from the first time you asked a similar question in July?