diff --git a/prospect/core.rkt b/prospect/core.rkt
index 6a87f0e..816fa7e 100644
--- a/prospect/core.rkt
+++ b/prospect/core.rkt
@@ -6,7 +6,6 @@
          (rename-out [quit <quit>])
          (except-out (struct-out spawn) spawn)
          (rename-out [spawn <spawn>])
-         (struct-out process)
          (struct-out transition)
          (struct-out world)
 
@@ -52,7 +51,9 @@
          sequence-transitions
 
          world-handle-event
-         clean-transition)
+         clean-transition
+
+         pretty-print-world)
 
 (require racket/set)
 (require racket/match)
@@ -61,6 +62,7 @@
 (require "route.rkt")
 (require "patch.rkt")
 (require "trace.rkt")
+(require "mux.rkt")
 (module+ test (require rackunit))
 
 ;; Events = Patches ∪ Messages
@@ -69,14 +71,6 @@
 ;; Actions ⊃ Events
 (struct spawn (boot) #:prefab)
 
-;; Processes (machine states): (process Matcher (U Behavior (disabled Behavior)) Any)
-(struct process (interests behavior state) #:transparent)
-
-;; Disabled Behaviors, when found in a Process, indicate that the
-;; process has been disabled and is waiting out the performance of its
-;; final actions before finally being removed.
-(struct disabled (behavior) #:transparent)
-
 ;; A Behavior is a ((Option Event) Any -> Transition): a function
 ;; mapping an Event (or, in the #f case, a poll signal) and a
 ;; Process's current state to a Transition.
@@ -98,12 +92,11 @@
 ;; A Label is a PID or 'meta.
 
 ;; VM private states
-(struct world (next-pid ;; PID
+(struct world (mux ;; Multiplexer
                pending-action-queue ;; (Queueof (Cons Label (U Action 'quit)))
                runnable-pids ;; (Setof PID)
-               routing-table ;; (Matcherof (Setof Label))
-               process-table ;; (HashTable PID Process)
-               environment-interests ;; (Matcherof (set 'meta))
+               behaviors ;; (HashTable PID Behavior)
+               states ;; (HashTable PID Any)
                ) #:transparent)
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -111,8 +104,6 @@
 (define (event? x) (or (patch? x) (message? x)))
 (define (action? x) (or (event? x) (spawn? x)))
 
-(define (meta-label? x) (eq? x 'meta))
-
 (define (prepend-at-meta pattern level)
   (if (zero? level)
       pattern
@@ -156,27 +147,29 @@
   (filter (lambda (x) (and (action? x) (not (patch-empty? x)))) (flatten actions)))
 
 (define (send-event e pid w)
-  (match (hash-ref (world-process-table w) pid #f)
-    [#f w]
-    [(process _ (? disabled?) _) w] ;; disabled due to earlier error or quit
-    [(and p (process _ behavior old-state))
-     (invoke-process pid
-                     (lambda () (clean-transition (ensure-transition (behavior e old-state))))
-                     (match-lambda
-                       [#f w]
-                       [(and q (quit final-actions))
-                        (trace-process-step e pid p #f q)
-                        (enqueue-actions (disable-process pid #f w) pid (append final-actions
-                                                                                (list 'quit)))]
-                       [(and t (transition new-state new-actions))
-                        (trace-process-step e pid p #f t)
-                        (update-process pid
-                                        (struct-copy process p [state new-state])
-                                        new-actions
-                                        w)])
-                     (lambda (exn)
-                       (trace-process-step e pid p exn #f)
-                       (enqueue-actions (disable-process pid exn w) pid (list 'quit))))]))
+  (define behavior (hash-ref (world-behaviors w) pid #f))
+  (define old-state (hash-ref (world-states w) pid #f))
+  (if (not behavior)
+      w
+      (invoke-process pid
+                      (lambda () (clean-transition (ensure-transition (behavior e old-state))))
+                      (match-lambda
+                        [#f w]
+                        [(and q (quit final-actions))
+                         (trace-process-step e pid behavior old-state #f q)
+                         (enqueue-actions (disable-process pid #f w) pid (append final-actions
+                                                                                 (list 'quit)))]
+                        [(and t (transition new-state new-actions))
+                         (trace-process-step e pid behavior old-state #f t)
+                         (enqueue-actions (mark-pid-runnable (update-state w pid new-state) pid)
+                                          pid
+                                          new-actions)])
+                      (lambda (exn)
+                        (trace-process-step e pid behavior old-state exn #f)
+                        (enqueue-actions (disable-process pid exn w) pid (list 'quit))))))
+
+(define (update-state w pid s)
+  (struct-copy world w [states (hash-set (world-states w) pid s)]))
 
 (define (send-event/guard delta pid w)
   (if (patch-empty? delta)
@@ -188,16 +181,9 @@
     (log-error "Process ~a died with exception:\n~a"
                (cons pid (trace-pid-stack))
                (exn->string exn)))
-  (match (hash-ref (world-process-table w) pid #f)
-    [#f w]
-    [old-p
-     (define new-p (struct-copy process old-p [behavior (disabled (process-behavior old-p))]))
-     (struct-copy world w [process-table (hash-set (world-process-table w) pid new-p)])]))
-
-(define (update-process pid p actions w)
-  (let* ((w (struct-copy world w [process-table (hash-set (world-process-table w) pid p)]))
-         (w (mark-pid-runnable w pid)))
-    (enqueue-actions w pid actions)))
+  (struct-copy world w
+               [behaviors (hash-remove (world-behaviors w) pid)]
+               [states (hash-remove (world-states w) pid)]))
 
 (define (invoke-process pid thunk k-ok k-exn)
   (define-values (ok? result)
@@ -223,11 +209,10 @@
   (quit actions))
 
 (define-syntax-rule (spawn-process behavior-exp initial-state-exp initial-patch-exp ...)
-  (spawn (lambda (pid)
-           (process (apply-patch (matcher-empty)
-                                 (label-patch (patch-seq initial-patch-exp ...) (set pid)))
-                    behavior-exp
-                    initial-state-exp))))
+  (spawn (lambda ()
+           (list (patch-seq initial-patch-exp ...)
+                 behavior-exp
+                 initial-state-exp))))
 
 (define-syntax-rule (spawn/stateless behavior-exp initial-patch-exp ...)
   (spawn-process (stateless-behavior-wrap behavior-exp)
@@ -244,18 +229,17 @@
   (make-spawn-world (lambda () (list boot-action ...))))
 
 (define (make-world boot-actions)
-  (world 0
+  (world (mux)
          (list->queue (for/list ((a (in-list (clean-actions boot-actions)))) (cons 'meta a)))
          (set)
-         (matcher-empty)
          (hash)
-         (matcher-empty)))
+         (hash)))
 
 (define (make-spawn-world boot-actions-thunk)
-  (spawn (lambda (pid)
-           (process (matcher-empty)
-                    world-handle-event
-                    (make-world (boot-actions-thunk))))))
+  (spawn (lambda ()
+           (list empty-patch
+                 world-handle-event
+                 (make-world (boot-actions-thunk))))))
 
 (define (transition-bind k t0)
   (match t0
@@ -300,112 +284,56 @@
 (define ((perform-action label a) w)
   (match a
     [(spawn boot)
-     (define new-pid (world-next-pid w))
      (invoke-process 'booting
                      (lambda ()
-                       (match (boot new-pid)
-                         [(? process? p) p]
-                         [other (error 'spawn
-                                       "Spawn boot procedure must yield process; received ~v"
-                                       other)]))
-                     (lambda (new-p)
-                       (define new-interests (process-interests new-p))
-                       (define new-w
-                         (update-process new-pid
-                                         new-p
-                                         '()
-                                         (struct-copy world w [next-pid (+ new-pid 1)])))
-                       (apply-patch-in-world new-pid (patch new-interests (matcher-empty)) new-w))
+                       (match (boot)
+                         [(and results (list (? patch?) (? procedure?) _))
+                          results]
+                         [other
+                          (error 'spawn
+                                 "Spawn boot procedure must yield boot spec; received ~v"
+                                 other)]))
+                     (lambda (results)
+                       (match-define (list initial-patch behavior initial-state) results)
+                       (define-values (new-mux new-pid patches meta-action)
+                         (mux-add-stream (world-mux w) initial-patch))
+                       (let* ((w (update-state w new-pid initial-state))
+                              (w (mark-pid-runnable w new-pid))
+                              (w (struct-copy world w
+                                              [mux new-mux]
+                                              [behaviors (hash-set (world-behaviors w)
+                                                                   new-pid
+                                                                   behavior)]))
+                              (w (deliver-patches w patches meta-action)))
+                         w))
                      (lambda (exn)
                        (log-error "Spawned process in world ~a died with exception:\n~a"
                                   (trace-pid-stack)
                                   (exn->string exn))
                        (transition w '())))]
     ['quit
-     (define pt (world-process-table w))
-     (match (hash-ref pt label #f)
-       [#f (transition w '())]
-       [(process interests _ _)
-        (define delta (patch (matcher-empty) interests))
-        (define-values (discarded-actions retained-actions)
-          (queue-partition (lambda (e) (equal? (car e) label)) (world-pending-action-queue w)))
-        (when (not (queue-empty? discarded-actions))
-          (log-error "Process ~a had ~a queued actions at exit"
-                     label
-                     (queue-length discarded-actions)))
-        (define new-w (struct-copy world w
-                                   [process-table (hash-remove pt label)]
-                                   [pending-action-queue retained-actions]))
-        (apply-patch-in-world label delta new-w)])]
+     (define-values (new-mux _label patches meta-action) (mux-remove-stream (world-mux w) label))
+     (deliver-patches (struct-copy world w [mux new-mux])
+                      ;; ^ behavior & state already removed by disable-process
+                      patches
+                      meta-action)]
     [(? patch? delta-orig)
-     (define p (hash-ref (world-process-table w) label #f))
-     (cond
-       [(or p (meta-label? label))
-        (define old-interests (if (meta-label? label)
-                                  (world-environment-interests w)
-                                  (process-interests p)))
-        (define delta (limit-patch (label-patch delta-orig (set label)) old-interests))
-        (define new-interests (apply-patch old-interests delta))
-        (define new-w
-          (if (meta-label? label)
-              (struct-copy world w [environment-interests new-interests])
-              (let* ((p (struct-copy process p [interests new-interests])))
-                (struct-copy world w [process-table (hash-set (world-process-table w) label p)]))))
-        (apply-patch-in-world label delta new-w)]
-       [else ;; we can still apply actions for nonexistent processes,
-             ;; but we have to limit the patches by consulting the
-             ;; whole routing table, making their zombie patch actions
-             ;; potentially less efficient.
-        (define delta (limit-patch/routing-table (label-patch delta-orig (set label))
-                                                 (world-routing-table w)))
-        (apply-patch-in-world label delta w)])]
+     (define-values (new-mux _label patches meta-action)
+       (mux-update-stream (world-mux w) label delta-orig))
+     (deliver-patches (struct-copy world w [mux new-mux])
+                      patches
+                      meta-action)]
     [(and m (message body))
-     (when (observe? body)
-       (log-warning "Process ~a sent message containing query ~v"
-                    (cons label (trace-pid-stack))
-                    body))
-     (cond
-       [(matcher-match-value (world-routing-table w) body #f) ;; some other process has declared m
-        (transition w '())]
-       [else
-        (define local-to-meta? (and (not (meta-label? label)) ;; it's from a local process, not envt
-                                    (at-meta? body))) ;; it relates to envt, not local
-        (define affected-pids (if local-to-meta?
-                                  (set)
-                                  (matcher-match-value (world-routing-table w) (observe body))))
-        (transition (for/fold [(w w)] [(pid (in-set affected-pids))]
-                      (send-event m pid w))
-                    (and local-to-meta?
-                         (message (at-meta-claim body))))])]))
+     (define-values (send-to-meta? affected-pids) (mux-route-message (world-mux w) label body))
+     (transition (for/fold [(w w)] [(pid (in-list affected-pids))]
+                   (send-event m pid w))
+                 (and send-to-meta? (message (at-meta-claim body))))]))
 
-;; PRECONDITION: delta has been limited to be minimal with respect to
-;; existing interests of its label in w's routing table.
-(define (apply-patch-in-world label delta w)
-  (define old-routing-table (world-routing-table w))
-  (define new-routing-table (apply-patch old-routing-table delta))
-  (define delta-aggregate (compute-aggregate-patch delta label old-routing-table))
-  (define affected-pids (let ((pids (compute-affected-pids old-routing-table delta)))
-                          (if (meta-label? label) pids (set-add pids label))))
-  (transition (for/fold [(w (struct-copy world w [routing-table new-routing-table]))]
-                        [(pid affected-pids)]
-                (cond [(equal? pid label)
-                       (define feedback
-                         (patch (biased-intersection new-routing-table (patch-added delta))
-                                (biased-intersection old-routing-table (patch-removed delta))))
-                       (send-event/guard feedback label w)]
-                      [else
-                       (define p (hash-ref (world-process-table w) pid))
-                       (define event (view-patch delta-aggregate (process-interests p)))
-                       (send-event/guard event pid w)]))
-              (and (not (meta-label? label))
-                   (drop-patch delta-aggregate))))
-
-(define (compute-affected-pids routing-table delta)
-  (define cover (matcher-union (patch-added delta) (patch-removed delta)))
-  (matcher-match-matcher (pattern->matcher #t (observe (embedded-matcher cover)))
-                         routing-table
-                         #:seed (set)
-                         #:combiner (lambda (v1 v2 acc) (set-union v2 acc))))
+(define (deliver-patches w patches meta-action)
+  (transition (for/fold [(w w)] [(entry (in-list patches))]
+                (match-define (cons label event) entry)
+                (send-event/guard event label w))
+              meta-action))
 
 (define (step-children w)
   (define runnable-pids (world-runnable-pids w))
@@ -416,6 +344,33 @@
                     (send-event #f pid w))
 		  '())))
 
+(define (pretty-print-world w [p (current-output-port)])
+  (local-require racket/pretty)
+  (match-define (world mux qs runnable behaviors states) w)
+  (fprintf p "WORLD:\n")
+  (fprintf p " - ~a queued actions\n" (queue-length qs))
+  (fprintf p " - ~a runnable pids ~a\n" (set-count runnable) (set->list runnable))
+  (fprintf p " - ~a live processes (~a with claims)\n"
+           (hash-count states)
+           (hash-count (mux-interest-table mux)))
+  (fprintf p " - next pid: ~a\n" (mux-next-pid mux))
+  (fprintf p " - routing table:\n")
+  (pretty-print-matcher (mux-routing-table mux) p)
+  (for ([pid (set-union (hash-keys (mux-interest-table mux)) (hash-keys states))])
+    (fprintf p " ---- process ~a, behavior ~v, STATE:\n" pid (hash-ref behaviors pid #f))
+    (define state (hash-ref states pid #f))
+    (display (indented-port-output 6 (lambda (p)
+                                       (if (world? state)
+                                           (pretty-print-world state p)
+                                           (pretty-write state p))))
+             p)
+    (newline p)
+    (fprintf p "      process ~a, behavior ~v, CLAIMS:\n" pid (hash-ref behaviors pid #f))
+    (display (indented-port-output 6 (lambda (p)
+                                       (pretty-print-matcher (mux-interests-of mux pid) p)))
+             p)
+    (newline p)))
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 (module+ test
diff --git a/prospect/mux.rkt b/prospect/mux.rkt
new file mode 100644
index 0000000..cae8886
--- /dev/null
+++ b/prospect/mux.rkt
@@ -0,0 +1,94 @@
+#lang racket/base
+;; General multiplexer.
+
+(provide meta-label?
+         (except-out (struct-out mux) mux)
+         (rename-out [mux <mux>] [make-mux mux])
+         mux-add-stream
+         mux-remove-stream
+         mux-update-stream
+         mux-route-message
+         mux-interests-of)
+
+(require racket/set)
+(require racket/match)
+(require "route.rkt")
+(require "patch.rkt")
+(require "trace.rkt")
+
+;; A PID is a Nat.
+;; A Label is a PID or 'meta.
+;; Multiplexer private states
+(struct mux (next-pid ;; PID
+             routing-table ;; (Matcherof (Setof Label))
+             interest-table ;; (HashTable Label Matcher)
+             ) #:transparent)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(define (meta-label? x) (eq? x 'meta))
+
+(define (make-mux)
+  (mux 0 (matcher-empty) (hash)))
+
+(define (mux-add-stream m initial-patch)
+  (define new-pid (mux-next-pid m))
+  (mux-update-stream (struct-copy mux m [next-pid (+ new-pid 1)])
+                     new-pid
+                     initial-patch))
+
+(define (mux-remove-stream m label)
+  (mux-update-stream m label (patch (matcher-empty) (pattern->matcher #t ?))))
+
+(define (mux-update-stream m label delta-orig)
+  (define old-interests (mux-interests-of m label))
+  (define delta (limit-patch (label-patch delta-orig (set label)) old-interests))
+  (define new-interests (apply-patch old-interests delta))
+  (let* ((m (struct-copy mux m
+                         [interest-table
+                          (if (matcher-empty? new-interests)
+                              (hash-remove (mux-interest-table m) label)
+                              (hash-set (mux-interest-table m) label new-interests))])))
+    ;; CONDITION at this point: delta has been labelled and limited to
+    ;; be minimal with respect to existing interests of its label.
+    (define old-routing-table (mux-routing-table m))
+    (define new-routing-table (apply-patch old-routing-table delta))
+    (define delta-aggregate (compute-aggregate-patch delta label old-routing-table))
+    (define affected-pids (let ((pids (compute-affected-pids old-routing-table delta)))
+                            (set-remove (set-add pids label) 'meta))) ;; TODO: removing meta is weird
+    (values (struct-copy mux m [routing-table new-routing-table])
+            label
+            (for/list [(pid affected-pids)]
+              (cond [(equal? pid label)
+                     (define feedback
+                       (patch (biased-intersection new-routing-table (patch-added delta))
+                              (biased-intersection old-routing-table (patch-removed delta))))
+                     (cons label feedback)]
+                    [else
+                     (cons pid (view-patch delta-aggregate (mux-interests-of m pid)))]))
+            (and (not (meta-label? label))
+                 (drop-patch delta-aggregate)))))
+
+(define (compute-affected-pids routing-table delta)
+  (define cover (matcher-union (patch-added delta) (patch-removed delta)))
+  (matcher-match-matcher (pattern->matcher #t (observe (embedded-matcher cover)))
+                         routing-table
+                         #:seed (set)
+                         #:combiner (lambda (v1 v2 acc) (set-union v2 acc))))
+
+(define (mux-route-message m label body)
+  (when (observe? body)
+    (log-warning "Stream ~a sent message containing query ~v"
+                 (cons label (trace-pid-stack))
+                 body))
+  (cond
+    [(matcher-match-value (mux-routing-table m) body #f) ;; some other stream has declared body
+     (values #f '())]
+    [(and (not (meta-label? label)) ;; it's from a local process, not envt
+          (at-meta? body)) ;; it relates to envt, not local
+     (values #t '())]
+    [else
+     (values #f (set->list (matcher-match-value (mux-routing-table m) (observe body))))]))
+
+(define (mux-interests-of m label)
+  (hash-ref (mux-interest-table m) label (matcher-empty)))
diff --git a/prospect/trace.rkt b/prospect/trace.rkt
index 6ddbba1..15b560a 100644
--- a/prospect/trace.rkt
+++ b/prospect/trace.rkt
@@ -8,9 +8,12 @@
 	 trace-process-step
 	 trace-internal-step
 
-         exn->string) ;; required from web-server/private/util
+         exn->string ;; required from web-server/private/util
+         string-indent
+         indented-port-output)
 
 (require (only-in web-server/private/util exn->string))
+(require (only-in racket/string string-join string-split))
 
 (define trace-logger (make-logger 'minimart-trace))
 
@@ -30,13 +33,22 @@
     (log-message trace-logger 'info name "" r #f)))
 
 ;; Event PID Process (Option Exception) (Option Transition) -> Void
-(define (trace-process-step e pid p exn t)
+(define (trace-process-step e pid beh st exn t)
   (when exn
     (log-error "Process ~a died with exception:\n~a"
 	       (cons pid (trace-pid-stack))
 	       (exn->string exn)))
-  (record-trace-event 'process-step (list (cons pid (trace-pid-stack)) e p exn t)))
+  (record-trace-event 'process-step (list (cons pid (trace-pid-stack)) e beh st exn t)))
 
 ;; PID Action World Transition -> Void
 (define (trace-internal-step pid a w t)
   (record-trace-event 'internal-step (list (cons pid (trace-pid-stack)) a w t)))
+
+(define (string-indent amount s)
+  (define pad (make-string amount #\space))
+  (string-join (for/list [(line (string-split s "\n"))] (string-append pad line)) "\n"))
+
+(define (indented-port-output amount f)
+  (define p (open-output-string))
+  (f p)
+  (string-indent amount (get-output-string p)))
diff --git a/prospect/trace/stderr.rkt b/prospect/trace/stderr.rkt
index 9d43ea1..64cb238 100644
--- a/prospect/trace/stderr.rkt
+++ b/prospect/trace/stderr.rkt
@@ -9,6 +9,7 @@
 (require (only-in web-server/private/util exn->string))
 (require "../core.rkt")
 (require "../trace.rkt")
+(require "../mux.rkt")
 
 (define (env-aref varname default alist)
   (define key (or (getenv varname) default))
@@ -95,7 +96,7 @@
     (let loop ()
       (match-define (vector level message-string data event-name) (sync receiver))
       (match* (event-name data)
-	[('process-step (list pids e p exn t))
+	[('process-step (list pids e beh st exn t))
 	 (define pidstr (format-pids pids))
 	 (define relevant-exn? (and show-exceptions? exn))
 	 (match e
@@ -113,22 +114,23 @@
 			  (output "~a received a message:\n" pidstr)
 			  (pretty-write body (current-error-port))))])
 	 (when (or relevant-exn? show-process-states-pre?)
-	   (when (or relevant-exn? (not (boring-state? (process-state p))))
+	   (when (or relevant-exn? (not (boring-state? st)))
 	     (with-color YELLOW
 			 (output "~a's state just before the event:\n" pidstr)
-			 (output-state (process-state p)))))
+			 (output-state st))))
 	 (when relevant-exn?
 	   (with-color WHITE-ON-RED
-		       (output "Process ~a died with exception:\n~a\n"
+		       (output "Process ~a ~v died with exception:\n~a\n"
 			       pidstr
+                               beh
 			       (exn->string exn))))
          (when (quit? t)
            (with-color BRIGHT-RED
-             (output "Process ~a exited normally.\n" pidstr)))
+             (output "Process ~a ~v exited normally.\n" pidstr beh)))
 	 (when (or relevant-exn? show-process-states-post?)
 	   (when (transition? t)
 	     (unless (boring-state? (transition-state t))
-	       (when (not (equal? (process-state p) (transition-state t)))
+	       (when (not (equal? st (transition-state t)))
 		 (with-color YELLOW
 			     (output "~a's state just after the event:\n" pidstr)
 			     (output-state (transition-state t)))))))]
@@ -136,16 +138,16 @@
 	 (when t ;; inert worlds don't change interestingly
 	   (define pidstr (format-pids pids))
 	   (define new-w (if (transition? t) (transition-state t) old-w))
-	   (define old-processes (world-process-table old-w))
-	   (define new-processes (world-process-table new-w))
-	   (define newcount (hash-count new-processes))
+	   (define newcount (hash-count (world-behaviors new-w)))
 	   (match a
 	     [(? spawn?)
 	      (when (or show-process-lifecycle? show-actions?)
-		(define newpid (set-first (set-subtract (hash-keys new-processes)
-							(hash-keys old-processes))))
+		(define newpid (set-first (set-subtract (hash-keys (world-behaviors new-w))
+							(hash-keys (world-behaviors old-w)))))
 		(define newpidstr (format-pids (cons newpid (cdr pids)))) ;; replace parent pid
-                (match-define (process interests behavior state) (hash-ref new-processes newpid))
+                (define interests (mux-interests-of (world-mux new-w) newpid))
+                (define behavior (hash-ref (world-behaviors new-w) newpid))
+                (define state (hash-ref (world-states new-w) newpid))
 		(with-color BRIGHT-GREEN
 			    (output "~a ~v spawned from ~a (~a total processes now)\n"
 				    newpidstr
@@ -160,20 +162,14 @@
 		  (pretty-print-matcher interests (current-error-port))))]
 	     ['quit
 	      (when (or show-process-lifecycle? show-actions?)
-		(match (hash-ref old-processes (car pids) (lambda () #f))
-		  [#f (void)]
-		  [(process interests behavior state)
-		   (with-color BRIGHT-RED
-			       (output "~a ~v exited (~a total processes now)\n"
-				       pidstr
-                                       behavior
-				       newcount))
-		   (unless (boring-state? state)
-		     (output "~a's final state:\n" pidstr)
-		     (output-state state))
-		   (unless (matcher-empty? interests)
-		     (output "~a's final interests:\n" pidstr)
-		     (pretty-print-matcher interests (current-error-port)))]))]
+                (define interests (mux-interests-of (world-mux old-w) (car pids)))
+                (with-color BRIGHT-RED
+                  (output "~a exited (~a total processes now)\n"
+                          pidstr
+                          newcount))
+                (unless (matcher-empty? interests)
+                  (output "~a's final interests:\n" pidstr)
+                  (pretty-print-matcher interests (current-error-port))))]
 	     [(? patch? p)
 	      (when (or show-actions? show-patch-actions?)
 		(output "~a performed a patch:\n" pidstr)
@@ -183,11 +179,12 @@
 		(output "~a sent a message:\n" pidstr)
 		(pretty-write body (current-error-port)))])
 	   (when show-routing-table?
-	     (when (not (equal? (world-routing-table old-w) (world-routing-table new-w)))
+             (define old-table (mux-routing-table (world-mux old-w)))
+             (define new-table (mux-routing-table (world-mux new-w)))
+	     (when (not (equal? old-table new-table))
 	       (with-color BRIGHT-BLUE
 			   (output "~a's routing table:\n" (format-pids (cdr pids)))
-			   (pretty-print-matcher (world-routing-table new-w)
-						 (current-error-port))))))])
+			   (pretty-print-matcher new-table (current-error-port))))))])
       (loop))))
 
 (void (when (not (set-empty? flags))