using xp serial number on multiple pcs

[mr_incredible]

I used original xp home cd. Nagtry lang ako kung ivavalidate using the same cdkey sa laptop ng sister ko and voila, ok sya. Try it yourself. May nagsabi sa akin sa isang PC store na Microsoft allows 3 PCs sa isang licensed cdkey daw.I don't know if that's true kase I know its one pc one license policy nila.

No. Microsoft does not allow multiple PCs using the same serial number unless it's through their Open License program for Enterprise Editions of XP.