The portability of a notebook computer is a real boon, but it’s not much good if the power never lasts long enough to make it through a domestic flight or a meeting. Although manufacturers design processors and notebook systems to throttle down when simple tasks are being performed on them, you can take it even further yourself by tweaking the power options. Windows XP and Vista bother offer ways to customize the power use of notebooks and this new guide shows you how to access them.