sorry to correct, but tu, you got it all wrong, UNIX nowadays, is a designe philosphy. and pa-risc is not the only arch procs that unix can use, what about sparcs, alpha, m68k, x86-64, ppc, mips, vax, sh-x, arm, Xscale and probaly others, almost any kind of processer can run some form of unix. and will im saying that, it been a while since windows supported the alpha. umm, linux supports more hardware then windows does,