Hello,
You must have got a lot of replies, but I am just sending
my views about it.  It get ur idea that you wanna better
understanding of the OS.  But I really wonder whether the
system will behave sane if you do the changes.  You have
not told abt ur M/c.  If it is a IBM compatible, then
you should go to the source code and try to grep on the
kernel data structures that you know, like, GDT, LDT, etc,.

Pl. tell me if you get some results, thanx,
Piras