diff --git a/v4/ContextController.py b/v4/ContextController.py
deleted file mode 100644
index ee8e673..0000000
--- a/v4/ContextController.py
+++ /dev/null
@@ -1,22 +0,0 @@
-import memory_Context
-
-class ContextController:
-  def __init__(self):
-    self.c = memory_createContext()
-  
-  def executeFunctions(self):
-    pass
-
-  def reportCallbacks(self):
-    pass
-
-  def set(self, field, value):
-    setattr(self.c, field, value)
-    self.c.recentField = field
-    self.executeFunctions()
-    self.reportCallbacks()
-
-ctrl = ContextController()
-ctrl.callback(printOutput)
-
-ctrl.set("didLaunch", True)
diff --git a/v4/Controller.py b/v4/Controller.py
new file mode 100644
index 0000000..c0310a1
--- /dev/null
+++ b/v4/Controller.py
@@ -0,0 +1,44 @@
+import copy
+
+class Controller:
+  def __init__(self, c):
+    self.callbacks = []
+    self.context = c
+    self.functions = []
+    self.isProcessingQueue = False
+    self.queue = []
+  
+  def executeFunctions(self):
+    c = self.queue.pop(0)
+    for f in self.functions:
+      ctx = f(c)
+      if ctx.recentField != "none":
+        self.queue.append(ctx)
+    self.context = c
+    self.reportContext()
+
+  def processQueue(self):
+    # Decline recursion.
+    if self.isProcessingQueue:
+      return
+    self.isProcessingQueue = True
+    while len(self.queue) > 0:
+      self.executeFunctions()
+    self.isProcessingQueue = False
+
+  def registerCallback(self, cb):
+    self.callbacks.append(cb)
+
+  def registerFunction(self, f):
+    self.functions.append(f)
+
+  def reportContext(self):
+    for cb in self.callbacks:
+      cb(self.context)
+
+  def set(self, fieldName, value):
+    c = copy.deepcopy(self.context)
+    setattr(c, fieldName, value)
+    c.recentField = fieldName
+    self.queue.append(c)
+    self.processQueue()
diff --git a/v4/main.py b/v4/main.py
index fecfcfa..cfb2a06 100644
--- a/v4/main.py
+++ b/v4/main.py
@@ -1,6 +1,7 @@
 from cli import *
 from cli_test import *
 from memory_test import *
+from Controller import *
 #from shell import *
 #import sys
 
@@ -20,14 +21,15 @@ print(cli_test_greetUser())
 #print(cli_test_showHelp_h())
 #print(cli_test_showHelp_help())
 
-def printOutput(c):
-  if c.recentField.startswith("output")):
-    print(getatter(c, c.recentField))
 
-ctrl = ContextController()
-ctrl.callback(printOutput)
+ctrl = Controller(memory_createContext())
+ctrl.registerFunction(cli_greetUser)
+ctrl.registerCallback(lambda c: print(f"ИГР App.dbg ctx: '{c}'"))
 
-ctrl.set("didLaunch", True)
+def printOutput(c):
+  if c.recentField.startswith("output"):
+    print(getattr(c, c.recentField))
+ctrl.registerCallback(printOutput)
 
 
 #
@@ -46,3 +48,5 @@ ctrl.set("didLaunch", True)
 #  if c.exit:
 #      break
 #  print(c.output)
+
+ctrl.set("didLaunch", True)