Question about WPA.DBL and my copy of XP ?

[Cti]

I have a copy of XP Home which came with my Sony, I backed it up right away and put on a different OS ( it was activated ), now I am pretty sure it is a OEM copy.

Now I can easily restore my XP Home, grab my WPA.DBL and integrate into my CD, this is where I need some info, can I then install this copy of XP Home on my desktop and it still be activated ?

Also what would happen if I tried to run the same copy on both machines ?