Reserved for exclusive use by something. The term might mean only writable by whatever it is sacred to. For example, "Register 7 is sacred to the interrupt handler" would mean that if any other code changed the contents of register 7, dire consequences would ensue. [href="module.php?name=Lexikon&file=search&eid=1&query=Jargon File">Jargon File] (2002-12-30)