diff --git a/docs/api.md b/docs/api.md
index b8c6a15..6417406 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -176,46 +176,46 @@ for consistency.
 
 The code-entry Helper object has the following API:
 
-* `update_nameplates()`: requests an updated list of nameplates from the
+* `refresh_nameplates()`: requests an updated list of nameplates from the
   Rendezvous Server. These form the first portion of the wormhole code (e.g.
   "4" in "4-purple-sausages"). Note that they are unicode strings (so "4",
   not 4). The Helper will get the response in the background, and calls to
-  `complete_nameplate()` after the response will use the new list.
-* `completions = h.complete_nameplate(prefix)`: returns (synchronously) a
-  list of suffixes for the given nameplate prefix. For example, if the server
-  reports nameplates 1, 12, 13, 24, and 170 are in use,
-  `complete_nameplate("1")` will return `["", "2", "3", "70"]`. Raises
-  `AlreadyClaimedNameplateError` if called after `h.claim_nameplate`.
-* `d = h.claim_nameplate(nameplate)`: accepts a string with the chosen
-  nameplate. May only be called once, after which `OnlyOneNameplateError` is
-  raised. Returns a Deferred that fires (with None) when the nameplate's
-  wordlist is known (which happens after the nameplate is claimed, requiring
-  a roundtrip to the server).
-* `completions = h.complete_words(prefix)`: return (synchronously) a list of
-  suffixes for the given words prefix. The possible completions depend upon
-  the wordlist in use for the previously-claimed nameplate, so calling this
-  before `claim_nameplate` will raise `MustClaimNameplateFirstError`. Given a
-  prefix like "su", this returns a list of strings which are appropriate to
-  append to the prefix (e.g. `["pportive", "rrender", "spicious"]`, for
-  expansion into "supportive", "surrender", and "suspicious". The prefix
-  should not include the nameplate, but *should* include whatever words and
-  hyphens have been typed so far (the default wordlist uses alternate lists,
-  where even numbered words have three syllables, and odd numbered words have
-  two, so the completions depend upon how many words are present, not just
-  the partial last word). E.g. `complete_words("pr")` will return
-  `["ocessor", "ovincial", "oximate"]`, while `complete_words("opulent-pr")`
-  will return `["eclude", "efer", "eshrunk", "inter", "owler"]`.
-  If the wordlist is not yet known (i.e. the Deferred from `claim_nameplate`
-  has not yet fired), this returns an empty list. It will also return an
-  empty list if the prefix is complete (the last word matches something in
-  the completion list, and there are no longer extension words), although the
-  code may not yet be complete if there are additional words. The completions
-  will never include a hyphen: the UI frontend must supply these if desired.
-* `h.submit_words(words)`: call this when the user is finished typing in the
+  `get_nameplate_completions()` after the response will use the new list.
+* `completions = h.get_nameplate_completions(prefix)`: returns
+  (synchronously) a list of suffixes for the given nameplate prefix. For
+  example, if the server reports nameplates 1, 12, 13, 24, and 170 are in
+  use, `get_nameplate_completions("1")` will return `["", "2", "3", "70"]`.
+  Raises `AlreadyClaimedNameplateError` if called after `h.choose_nameplate`.
+* `h.choose_nameplate(nameplate)`: accepts a string with the chosen nameplate.
+  May only be called once, after which `OnlyOneNameplateError` is raised. (in
+  this future, this might return a Deferred that fires (with None) when the
+  nameplate's wordlist is known (which happens after the nameplate is
+  claimed, requiring a roundtrip to the server)).
+* `completions = h.get_word_completions(prefix)`: return (synchronously) a
+  list of suffixes for the given words prefix. The possible completions
+  depend upon the wordlist in use for the previously-claimed nameplate, so
+  calling this before `choose_nameplate` will raise
+  `MustClaimNameplateFirstError`. Given a prefix like "su", this returns a
+  list of strings which are appropriate to append to the prefix (e.g.
+  `["pportive", "rrender", "spicious"]`, for expansion into "supportive",
+  "surrender", and "suspicious". The prefix should not include the nameplate,
+  but *should* include whatever words and hyphens have been typed so far (the
+  default wordlist uses alternate lists, where even numbered words have three
+  syllables, and odd numbered words have two, so the completions depend upon
+  how many words are present, not just the partial last word). E.g.
+  `get_word_completions("pr")` will return `["ocessor", "ovincial",
+  "oximate"]`, while `get_word_completions("opulent-pr")` will return
+  `["eclude", "efer", "eshrunk", "inter", "owler"]`. If the wordlist is not
+  yet known, this returns an empty list. It will also return an empty list if
+  the prefix is complete (the last word matches something in the completion
+  list, and there are no longer extension words), although the code may not
+  yet be complete if there are additional words. The completions will never
+  include a hyphen: the UI frontend must supply these if desired.
+* `h.choose_words(words)`: call this when the user is finished typing in the
   code. It does not return anything, but will cause the Wormhole's
   `w.when_code()` (or corresponding delegate) to fire, and triggers the
   wormhole connection process. This accepts a string like "purple-sausages",
-  without the nameplate. It must be called after `h.claim_nameplate()` or
+  without the nameplate. It must be called after `h.choose_nameplate()` or
   `MustClaimNameplateFirstError` will be raised.
 
 The `rlcompleter` wrapper is a function that knows how to use the code-entry
diff --git a/docs/state-machines/allocator.dot b/docs/state-machines/allocator.dot
index eb0b9d3..e0bd542 100644
--- a/docs/state-machines/allocator.dot
+++ b/docs/state-machines/allocator.dot
@@ -11,8 +11,12 @@ digraph {
         S0B -> P_allocate [label="allocate"]
         P_allocate [shape="box" label="RC.tx_allocate" color="orange"]
         P_allocate -> S1B [color="orange"]
-        S1B [label="S1B:\nallocating" color="orange"]
-        S1B -> S1A [label="lost"]
+        {rank=same; S1A P_allocate S1B}
+        S0B -> S1B [style="invis"]
+        S1B [label="S1B:\nallocating\nconnected" color="orange"]
+        S1B -> foo [label="lost"]
+        foo [style="dotted" label=""]
+        foo -> S1A
         S1A [label="S1A:\nallocating\ndisconnected" color="orange"]
         S1A -> P_allocate [label="connected" color="orange"]
 
diff --git a/docs/state-machines/boss.dot b/docs/state-machines/boss.dot
index d8e3380..43e770e 100644
--- a/docs/state-machines/boss.dot
+++ b/docs/state-machines/boss.dot
@@ -12,7 +12,7 @@ digraph {
 
         {rank=same; P0_code S0}
         P0_code [shape="box" style="dashed"
-                 label="input -> Code.input\n or allocate -> Code.allocate\n or set_code -> Code.set_code"]
+                 label="C.input_code\n or C.allocate_code\n or C.set_code"]
         P0_code -> S0
         S0 [label="S0: empty"]
         S0 -> P0_build [label="set_code"]
@@ -22,7 +22,7 @@ digraph {
         P_close_error -> S_closing
         S0 -> P_close_lonely [label="close"]
 
-        P0_build [shape="box" label="W.got_code\nN.set_nameplate\nK.got_code"]
+        P0_build [shape="box" label="W.got_code"]
         P0_build -> S1
         S1 [label="S1: lonely" color="orange"]
 
@@ -67,7 +67,7 @@ digraph {
 
         {rank=same; Other S_closed}
         Other [shape="box" style="dashed"
-               label="rx_welcome -> process\nsend -> S.send\ngot_message -> got_version or got_phase\ngot_key -> W.got_key\ngot_verifier -> W.got_verifier\nallocate -> C.allocate\ninput -> C.input\nset_code -> C.set_code"
+               label="rx_welcome -> process\nsend -> S.send\ngot_message -> got_version or got_phase\ngot_key -> W.got_key\ngot_verifier -> W.got_verifier\nallocate_Code -> C.allocate_code\ninput_code -> C.input_code\nset_code -> C.set_code"
                ]
 
 
diff --git a/docs/state-machines/code.dot b/docs/state-machines/code.dot
index 35940f8..dcb66d3 100644
--- a/docs/state-machines/code.dot
+++ b/docs/state-machines/code.dot
@@ -1,27 +1,39 @@
 digraph {
 
-        start [label="C:\nCode\nManagement" style="dotted"]
+        start [label="C:\nCode\n(management)" style="dotted"]
         {rank=same; start S0}
         start -> S0 [style="invis"]
         S0 [label="S0:\nidle"]
         S0 -> P0_got_code [label="set_code"]
-        P0_got_code [shape="box" label="B.got_code"]
-        P0_got_code -> S3
-        S3 [label="S3: known" color="green"]
+        P0_got_code [shape="box" label="N.set_nameplate"]
+        P0_got_code -> P_done
+        P_done [shape="box" label="K.got_code\nB.got_code"]
+        P_done -> S5
+        S5 [label="S5: known" color="green"]
 
-        {rank=same; S1_inputting S2_allocating}
+        {rank=same; S1_inputting_nameplate S3_allocating}
+        {rank=same; P0_got_code P1_set_nameplate P3_got_nameplate}
         S0 -> P_input [label="input_code"]
         P_input [shape="box" label="I.start"]
-        P_input -> S1_inputting
-        S1_inputting [label="S1:\ninputting"]
-        S1_inputting -> P0_got_code [label="finished_input"]
+        P_input -> S1_inputting_nameplate
+        S1_inputting_nameplate [label="S1:\ninputting\nnameplate"]
+        S1_inputting_nameplate -> P1_set_nameplate [label="got_nameplate"]
+        P1_set_nameplate [shape="box" label="N.set_nameplate"]
+        P1_set_nameplate -> S2_inputting_words
+        S2_inputting_words [label="S2:\ninputting\nwords"]
+        S2_inputting_words -> P1_got_words [label="finished_input"]
+        P1_got_words [shape="box" label="assemble\ncode"]
+        P1_got_words -> P_done
+        P_done
 
         S0 -> P_allocate [label="allocate_code"]
         P_allocate [shape="box" label="A.allocate"]
-        P_allocate -> S2_allocating
-        S2_allocating [label="S2:\nallocating"]
-        S2_allocating -> P1_generate [label="allocated_nameplate"]
-        P1_generate [shape="box" label="generate\nrandom words"]
-        P1_generate -> P0_got_code
+        P_allocate -> S3_allocating
+        S3_allocating [label="S3:\nallocating"]
+        S3_allocating -> P3_got_nameplate [label="allocated_nameplate"]
+        P3_got_nameplate [shape="box" label="N.set_nameplate"]
+        P3_got_nameplate -> P3_generate
+        P3_generate [shape="box" label="append\nrandom words"]
+        P3_generate -> P_done
 
 }
diff --git a/docs/state-machines/input.dot b/docs/state-machines/input.dot
index 3a68ac4..06013fc 100644
--- a/docs/state-machines/input.dot
+++ b/docs/state-machines/input.dot
@@ -5,28 +5,39 @@ digraph {
         start -> S0 [style="invis"]
         S0 [label="S0:\nidle"]
 
-        S0 -> P0_list_nameplates [label="start" color="orange"]
-        P0_list_nameplates [shape="box" label="L.refresh_nameplates" color="orange"]
-        P0_list_nameplates -> S1 [color="orange"]
+        S0 -> P0_list_nameplates [label="start"]
+        P0_list_nameplates [shape="box" label="L.refresh"]
+        P0_list_nameplates -> S1
         S1 [label="S1: typing\nnameplate" color="orange"]
 
         {rank=same; foo P0_list_nameplates}
-        S1 -> foo [label="update_nameplates"]
+        S1 -> foo [label="refresh_nameplates" color="orange" fontcolor="orange"]
         foo [style="dashed" label=""]
         foo -> P0_list_nameplates
 
-        S1 -> P1_claim [label="claim_nameplate" color="orange" fontcolor="orange"]
-        P1_claim [shape="box" label="N.set_nameplate" color="orange"]
-        P1_claim -> S2 [color="orange"]
-        S2 [label="S2: typing\ncode\n(no wordlist)" color="orange"]
-        S2 -> P2_stash_wordlist [label="got_nameplates" color="orange"]
-        P2_stash_wordlist [shape="box" label="stash\nwordlist" color="orange"]
-        P2_stash_wordlist -> S3 [color="orange"]
-        S2 -> P_done [label="submit_words"]
-        S3 [label="S3: typing\ncode\n(yes wordlist)" color="orange"]
-        S3 -> P_done [label="submit_words" color="orange" fontcolor="orange"]
-        P_done [shape="box" label="C.finished_input" color="orange"]
-        P_done -> S4 [color="orange"]
-        S4 [label="S4: known" color="green"]
+        S1 -> P1_record [label="got_nameplates"]
+        P1_record [shape="box" label="record\nnameplates"]
+        P1_record -> S1
 
+        S1 -> P1_claim [label="choose_nameplate" color="orange" fontcolor="orange"]
+        P1_claim [shape="box" label="stash nameplate\nC.got_nameplate"]
+        P1_claim -> S2
+        S2 [label="S2: typing\ncode\n(no wordlist)"]
+        S2 -> S2 [label="got_nameplates"]
+        S2 -> P2_stash_wordlist [label="got_wordlist"]
+        P2_stash_wordlist [shape="box" label="stash wordlist"]
+        P2_stash_wordlist -> S3
+        S2 -> P_done [label="choose_words" color="orange" fontcolor="orange"]
+        S3 [label="S3: typing\ncode\n(yes wordlist)"]
+        S3 -> S3 [label="got_nameplates"]
+        S3 -> P_done [label="choose_words" color="orange" fontcolor="orange"]
+        P_done [shape="box" label="build code\nC.finished_input"]
+        P_done -> S4
+        S4 [label="S4: done" color="green"]
+        S4 -> S4 [label="got_nameplates\ngot_wordlist"]
+
+        other [shape="box" style="dotted"
+               label="h.refresh_nameplates()\nh.get_nameplate_completions(prefix)\nh.choose_nameplate(nameplate)\nh.get_word_completions(prefix)\nh.choose_words(words)"
+               ]
+        {rank=same; S4 other}
 }
diff --git a/docs/state-machines/lister.dot b/docs/state-machines/lister.dot
index c7300e7..03ddd32 100644
--- a/docs/state-machines/lister.dot
+++ b/docs/state-machines/lister.dot
@@ -31,12 +31,9 @@ digraph {
         foo2 [label="" style="dashed"]
         foo2 -> P_tx
 
-        S0B -> P_notify [label="rx"]
-        S1B -> P_notify [label="rx" color="orange" fontcolor="orange"]
-        P_notify [shape="box" label="C.got_nameplates()"]
+        S0B -> P_notify [label="rx_nameplates"]
+        S1B -> P_notify [label="rx_nameplates" color="orange" fontcolor="orange"]
+        P_notify [shape="box" label="I.got_nameplates()"]
         P_notify -> S0B
 
-        {rank=same; foo foo2 legend}
-        legend [shape="box" style="dotted"
-                label="refresh: L.refresh_nameplates()\nrx: L.rx_nameplates()"]
 }
diff --git a/docs/state-machines/machines.dot b/docs/state-machines/machines.dot
index c84e9cb..015b138 100644
--- a/docs/state-machines/machines.dot
+++ b/docs/state-machines/machines.dot
@@ -2,8 +2,10 @@ digraph {
         Wormhole [shape="oval" color="blue" fontcolor="blue"]
         Boss [shape="box" label="Boss\n(manager)"
                   color="blue" fontcolor="blue"]
-        Nameplate [shape="box" color="blue" fontcolor="blue"]
-        Mailbox [shape="box" color="blue" fontcolor="blue"]
+        Nameplate [label="Nameplate\n(claimer)"
+                   shape="box" color="blue" fontcolor="blue"]
+        Mailbox [label="Mailbox\n(opener)"
+                 shape="box" color="blue" fontcolor="blue"]
         Connection [label="Rendezvous\nConnector"
                     shape="oval" color="blue" fontcolor="blue"]
         #websocket [color="blue" fontcolor="blue"]
@@ -16,9 +18,11 @@ digraph {
                 color="blue" fontcolor="blue"]
         Allocator [shape="box" label="(nameplate)\nAllocator"
                    color="blue" fontcolor="blue"]
-        Input [shape="box" label="(code)\nInput helper"
+        Input [shape="box" label="(interactive\ncode)\nInput"
                color="blue" fontcolor="blue"]
         Terminator [shape="box" color="blue" fontcolor="blue"]
+        InputHelperAPI [shape="oval" label="input\nhelper\nAPI"
+                        color="blue" fontcolor="blue"]
 
         #Connection -> websocket [color="blue"]
         #Connection -> Order [color="blue"]
@@ -36,11 +40,8 @@ digraph {
 
         Boss -> Send [style="dashed" color="red" fontcolor="red" label="send"]
 
-        Boss -> Nameplate [style="dashed" color="red" fontcolor="red"
-                           label="set_nameplate"]
         #Boss -> Mailbox [color="blue"]
         Mailbox -> Order [style="dashed" label="got_message (once)"]
-        Boss -> Key [style="dashed" label="got_code"]
         Key -> Boss [style="dashed" label="got_key\ngot_verifier\nscared"]
         Order -> Key [style="dashed" label="got_pake"]
         Order -> Receive [style="dashed" label="got_message"]
@@ -85,15 +86,18 @@ digraph {
                          ]
         #Code -> Lister [color="blue"]
         Input -> Lister [style="dashed" color="red" fontcolor="red"
-                         label="refresh_nameplates"
+                         label="refresh"
                          ]
         Boss -> Code [style="dashed" color="red" fontcolor="red"
                       label="allocate_code\ninput_code\nset_code"]
-        Code -> Boss [style="dashed"
-                      label="got_code"]
+        Code -> Boss [style="dashed" label="got_code"]
+        Code -> Key [style="dashed" label="got_code"]
+        Code -> Nameplate [style="dashed" label="set_nameplate"]
 
         Code -> Input [style="dashed" color="red" fontcolor="red" label="start"]
-        Input -> Code [style="dashed" label="finished_input"]
+        Input -> Code [style="dashed" label="got_nameplate\nfinished_input"]
+        InputHelperAPI -> Input [label="refresh_nameplates\nget_nameplate_completions\nchoose_nameplate\nget_word_completions\nchoose_words" color="orange" fontcolor="orange"]
+
         Code -> Allocator [style="dashed" color="red" fontcolor="red"
                            label="allocate"]
         Allocator -> Code [style="dashed" label="allocated"]
diff --git a/src/wormhole/_allocator.py b/src/wormhole/_allocator.py
new file mode 100644
index 0000000..f07f549
--- /dev/null
+++ b/src/wormhole/_allocator.py
@@ -0,0 +1,65 @@
+from __future__ import print_function, absolute_import, unicode_literals
+from zope.interface import implementer
+from attr import attrs, attrib
+from attr.validators import provides
+from automat import MethodicalMachine
+from . import _interfaces
+
+@attrs
+@implementer(_interfaces.IAllocator)
+class Allocator(object):
+    _timing = attrib(validator=provides(_interfaces.ITiming))
+    m = MethodicalMachine()
+    @m.setTrace()
+    def set_trace(): pass # pragma: no cover
+
+    def wire(self, rendezvous_connector, code):
+        self._RC = _interfaces.IRendezvousConnector(rendezvous_connector)
+        self._C = _interfaces.ICode(code)
+
+    @m.state(initial=True)
+    def S0A_idle(self): pass # pragma: no cover
+    @m.state()
+    def S0B_idle_connected(self): pass # pragma: no cover
+    @m.state()
+    def S1A_allocating(self): pass # pragma: no cover
+    @m.state()
+    def S1B_allocating_connected(self): pass # pragma: no cover
+    @m.state()
+    def S2_done(self): pass # pragma: no cover
+
+    # from Code
+    @m.input()
+    def allocate(self): pass
+
+    # from RendezvousConnector
+    @m.input()
+    def connected(self): pass
+    @m.input()
+    def lost(self): pass
+    @m.input()
+    def rx_allocated(self, nameplate): pass
+
+    @m.output()
+    def RC_tx_allocate(self):
+        self._RC.tx_allocate()
+    @m.output()
+    def C_allocated(self, nameplate):
+        self._C.allocated(nameplate)
+
+    S0A_idle.upon(connected, enter=S0B_idle_connected, outputs=[])
+    S0B_idle_connected.upon(lost, enter=S0A_idle, outputs=[])
+
+    S0A_idle.upon(allocate, enter=S1A_allocating, outputs=[])
+    S0B_idle_connected.upon(allocate, enter=S1B_allocating_connected,
+                            outputs=[RC_tx_allocate])
+
+    S1A_allocating.upon(connected, enter=S1B_allocating_connected,
+                        outputs=[RC_tx_allocate])
+    S1B_allocating_connected.upon(lost, enter=S1A_allocating, outputs=[])
+
+    S1B_allocating_connected.upon(rx_allocated, enter=S2_done,
+                                  outputs=[C_allocated])
+
+    S2_done.upon(connected, enter=S2_done, outputs=[])
+    S2_done.upon(lost, enter=S2_done, outputs=[])
diff --git a/src/wormhole/_boss.py b/src/wormhole/_boss.py
index f6c89f7..5805dc0 100644
--- a/src/wormhole/_boss.py
+++ b/src/wormhole/_boss.py
@@ -15,6 +15,8 @@ from ._key import Key
 from ._receive import Receive
 from ._rendezvous import RendezvousConnector
 from ._lister import Lister
+from ._allocator import Allocator
+from ._input import Input
 from ._code import Code
 from ._terminator import Terminator
 from .errors import (ServerError, LonelyError, WrongPasswordError,
@@ -49,6 +51,8 @@ class Boss(object):
                                        self._reactor, self._journal,
                                        self._tor_manager, self._timing)
         self._L = Lister()
+        self._A = Allocator(self._timing)
+        self._I = Input(self._timing)
         self._C = Code(self._timing)
         self._T = Terminator()
 
@@ -59,7 +63,9 @@ class Boss(object):
         self._K.wire(self, self._M, self._R)
         self._R.wire(self, self._S)
         self._RC.wire(self, self._N, self._M, self._C, self._L, self._T)
-        self._L.wire(self._RC, self._C)
+        self._L.wire(self._RC, self._I)
+        self._A.wire(self._RC, self._C)
+        self._I.wire(self._C, self._L)
         self._C.wire(self, self._RC, self._L)
         self._T.wire(self, self._RC, self._N, self._M)
 
@@ -189,8 +195,6 @@ class Boss(object):
 
     @m.output()
     def do_got_code(self, code):
-        nameplate = code.split("-")[0]
-        self._N.set_nameplate(nameplate)
         self._K.got_code(code)
         self._W.got_code(code)
     @m.output()
diff --git a/src/wormhole/_code.py b/src/wormhole/_code.py
index 563eca4..caa1a92 100644
--- a/src/wormhole/_code.py
+++ b/src/wormhole/_code.py
@@ -74,13 +74,11 @@ class Code(object):
     @m.input()
     def got_wordlist(self, wordlist): pass
 
-    # from CodeInputHelper
+    # from Input
     @m.input()
-    def update_nameplates(self): pass
+    def got_nameplate(self, nameplate): pass
     @m.input()
-    def claim_nameplate(self, nameplate): pass
-    @m.input()
-    def submit_words(self, words): pass
+    def finished_input(self, code): pass
 
     @m.output()
     def L_refresh_nameplates(self):
@@ -137,6 +135,7 @@ class Code(object):
         self._B_got_code()
 
     def _B_got_code(self):
+        self._N.set_nameplate(nameplate) XXX
         self._B.got_code(self._code)
 
     S0A_unknown.upon(connected, enter=S0B_unknown_connected, outputs=[])
diff --git a/src/wormhole/_input.py b/src/wormhole/_input.py
new file mode 100644
index 0000000..0103e83
--- /dev/null
+++ b/src/wormhole/_input.py
@@ -0,0 +1,106 @@
+from __future__ import print_function, absolute_import, unicode_literals
+from zope.interface import implementer
+from attr import attrs, attrib
+from attr.validators import provides
+from automat import MethodicalMachine
+from . import _interfaces
+
+@attrs
+@implementer(_interfaces.IInput)
+class Input(object):
+    _timing = attrib(validator=provides(_interfaces.ITiming))
+    m = MethodicalMachine()
+    @m.setTrace()
+    def set_trace(): pass # pragma: no cover
+
+    def __attrs_post_init__(self):
+        self._nameplate = None
+        self._wordlist = None
+        self._claimed_waiter = None
+
+    def wire(self, code, lister):
+        self._C = _interfaces.ICode(code)
+        self._L = _interfaces.ILister(lister)
+
+    @m.state(initial=True)
+    def S0_idle(self): pass # pragma: no cover
+    @m.state()
+    def S1_nameplate(self): pass # pragma: no cover
+    @m.state()
+    def S2_code_no_wordlist(self): pass # pragma: no cover
+    @m.state()
+    def S3_code_yes_wordlist(self): pass # pragma: no cover
+    @m.state(terminal=True)
+    def S4_done(self): pass # pragma: no cover
+
+    # from Code
+    @m.input()
+    def start(self): pass
+
+    # from Lister
+    @m.input()
+    def got_nameplates(self, nameplates): pass
+
+    # from Nameplate??
+    @m.input()
+    def got_wordlist(self, wordlist): pass
+
+    # from CodeInputHelper
+    @m.input()
+    def refresh_nameplates(self): pass
+    @m.input()
+    def _choose_nameplate(self, nameplate): pass
+    @m.input()
+    def choose_words(self, words): pass
+
+    @m.output()
+    def L_refresh_nameplates(self):
+        self._L.refresh_nameplates()
+    @m.output()
+    def start_and_L_refresh_nameplates(self, input_helper):
+        self._input_helper = input_helper
+        self._L.refresh_nameplates()
+    @m.output()
+    def stash_wordlist_and_notify(self, wordlist):
+        self._wordlist = wordlist
+        if self._claimed_waiter:
+            self._claimed_waiter.callback(None)
+            del self._claimed_waiter
+    @m.output()
+    def stash_nameplate(self, nameplate):
+        self._nameplate = nameplate
+    @m.output()
+    def C_got_nameplate(self, nameplate):
+        self._C.got_nameplate(nameplate)
+
+    @m.output()
+    def finished(self, words):
+        code = self._nameplate + "-" + words
+        self._C.finished_input(code)
+
+    S0_idle.upon(start, enter=S1_nameplate, outputs=[L_refresh_nameplates])
+    S1_nameplate.upon(refresh_nameplates, enter=S1_nameplate,
+                      outputs=[L_refresh_nameplates])
+    S1_nameplate.upon(_choose_nameplate, enter=S2_code_no_wordlist,
+                      outputs=[stash_nameplate, C_got_nameplate])
+    S2_code_no_wordlist.upon(got_wordlist, enter=S3_code_yes_wordlist,
+                             outputs=[stash_wordlist_and_notify])
+    S2_code_no_wordlist.upon(choose_words, enter=S4_done, outputs=[finished])
+    S3_code_yes_wordlist.upon(choose_words, enter=S4_done, outputs=[finished])
+
+    # methods for the CodeInputHelper to use
+    #refresh_nameplates/_choose_nameplate/choose_words: @m.input methods
+
+    def get_nameplate_completions(self, prefix):
+        completions = []
+        for nameplate in self._nameplates
+        pass
+    def choose_nameplate(self, nameplate):
+        if self._claimed_waiter is not None:
+            raise X
+        d = self._claimed_waiter = defer.Deferred()
+        self._choose_nameplate(nameplate)
+
+    def get_word_completions(self, prefix):
+        pass
+    
diff --git a/src/wormhole/_interfaces.py b/src/wormhole/_interfaces.py
index 565924c..f21e0dd 100644
--- a/src/wormhole/_interfaces.py
+++ b/src/wormhole/_interfaces.py
@@ -22,6 +22,10 @@ class ILister(Interface):
     pass
 class ICode(Interface):
     pass
+class IInput(Interface):
+    pass
+class IAllocator(Interface):
+    pass
 class ITerminator(Interface):
     pass
 
diff --git a/src/wormhole/_lister.py b/src/wormhole/_lister.py
index c43a927..dbd8d4b 100644
--- a/src/wormhole/_lister.py
+++ b/src/wormhole/_lister.py
@@ -9,9 +9,9 @@ class Lister(object):
     @m.setTrace()
     def set_trace(): pass # pragma: no cover
 
-    def wire(self, rendezvous_connector, code):
+    def wire(self, rendezvous_connector, input):
         self._RC = _interfaces.IRendezvousConnector(rendezvous_connector)
-        self._C = _interfaces.ICode(code)
+        self._I = _interfaces.IInput(input)
 
     # Ideally, each API request would spawn a new "list_nameplates" message
     # to the server, so the response would be maximally fresh, but that would
@@ -44,8 +44,8 @@ class Lister(object):
     def RC_tx_list(self):
         self._RC.tx_list()
     @m.output()
-    def C_got_nameplates(self, message):
-        self._C.got_nameplates(message["nameplates"])
+    def I_got_nameplates(self, message):
+        self._I.got_nameplates(message["nameplates"])
 
     S0A_idle_disconnected.upon(connected, enter=S0B_idle_connected, outputs=[])
     S0B_idle_connected.upon(lost, enter=S0A_idle_disconnected, outputs=[])
@@ -59,9 +59,9 @@ class Lister(object):
     S0B_idle_connected.upon(refresh_nameplates, enter=S1B_wanting_connected,
                             outputs=[RC_tx_list])
     S0B_idle_connected.upon(rx_nameplates, enter=S0B_idle_connected,
-                            outputs=[C_got_nameplates])
+                            outputs=[I_got_nameplates])
     S1B_wanting_connected.upon(lost, enter=S1A_wanting_disconnected, outputs=[])
     S1B_wanting_connected.upon(refresh_nameplates, enter=S1B_wanting_connected,
                                outputs=[RC_tx_list])
     S1B_wanting_connected.upon(rx_nameplates, enter=S0B_idle_connected,
-                               outputs=[C_got_nameplates])
+                               outputs=[I_got_nameplates])