Windows NT covers NT 3.5, NT 3.51, NT 4, 2000, XP (NT 5.1), Vista, and in
all guises, workstation and server..
Shadowing BIOS serves no useful purpose.. in fact, all of the above ignore
shadowed BIOS.. now if you were running their DOS based cousins, that would
be different.. but you are in an XP (NT 5.1) newsgroup..