The APC articles and others were already tried for that when Vista was in beta and later when released. Like any combination of two versions with one older the newer has to go on last to effectively see the older version added in as an option.
Once you go into a dual with XP you also lose the Vista restore points right away. That's when a work around has to be applied in order to see those preserved. But the main quesion will be on whether to dual boot on one drive or see XP as a separate stand alone installation. Despite the need for pressing the assigned F key at post time that can save a workd of hurt if either version has to be reinstalled at some point.
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