This question contains spoilers…
(view spoiler)[Jory says he sometimes calls himself Bill or Matt. In the beginning of the book, several if not all of the characters may have dreamed of Bill and Matt. Can we take this to mean they were dead the whole time? (hide spoiler)]
They were Dead the Whole Time. That's how the book is built. To draw us into the world of UBIK, Yet hold us at arms length, with us begging to be even closer to the reality that is UBIK. KEEP READING.