diff --git a/cmake/FindPythonWrapperMacro.cmake b/cmake/FindPythonWrapperMacro.cmake
index c3e9e657..ee6f0809 100644
--- a/cmake/FindPythonWrapperMacro.cmake
+++ b/cmake/FindPythonWrapperMacro.cmake
@@ -22,7 +22,9 @@ macro (triqs_python_extension ModuleName)
    ${CMAKE_SOURCE_DIR}/pytriqs/wrap_generator/wrapper.mako.cpp
    ${wrap_name}
    ${CMAKE_SOURCE_DIR}/pytriqs/wrap_generator/py_converter_wrapper.mako.hpp
-   ${converter_name} )
+   ${converter_name} 
+   ${CMAKE_BINARY_DIR}/include/pytriqs/converters/
+   )
 
  set_property (GLOBAL APPEND PROPERTY TRIQS_PY_CONVERTERS_TARGETS "python_wrap_${ModuleName}")
 
diff --git a/cmake/TRIQSConfig.cmake.in b/cmake/TRIQSConfig.cmake.in
index 229bff06..8a657ee4 100644
--- a/cmake/TRIQSConfig.cmake.in
+++ b/cmake/TRIQSConfig.cmake.in
@@ -95,7 +95,11 @@ macro (triqs_python_extension ModuleName)
    @CMAKE_INSTALL_PREFIX@/share/triqs/wrap_generator/wrapper.mako.cpp
    ${wrap_name}
    @CMAKE_INSTALL_PREFIX@/share/triqs/wrap_generator/py_converter_wrapper.mako.hpp
-   ${converter_name} )
+   ${converter_name}
+   # after this, list of paths for the header generated by the python wrapper generator
+   @CMAKE_INSTALL_PREFIX@/include/pytriqs/converters/
+   ${CMAKE_BINARY_DIR}/include/pytriqs/converters/
+   )
 
  #set_property (GLOBAL APPEND PROPERTY TRIQS_PY_CONVERTERS_TARGETS "python_wrap_${ModuleName}")
 
diff --git a/pytriqs/gf/local/gf_desc.py b/pytriqs/gf/local/gf_desc.py
index f849a230..4c85c8ea 100644
--- a/pytriqs/gf/local/gf_desc.py
+++ b/pytriqs/gf/local/gf_desc.py
@@ -473,6 +473,5 @@ module.add_function(name = "make_gf_from_inverse_fourier", signature="gf_view<re
 ########################
 
 if __name__ == '__main__' :
-   module.generate_code(mako_template = sys.argv[1], wrap_file = sys.argv[2])
-   module.generate_py_converter_header(mako_template = sys.argv[3], wrap_file = sys.argv[4])
+   module.generate_code()
 
diff --git a/pytriqs/lattice/lattice_tools_desc.py b/pytriqs/lattice/lattice_tools_desc.py
index 62863f41..1c733e60 100644
--- a/pytriqs/lattice/lattice_tools_desc.py
+++ b/pytriqs/lattice/lattice_tools_desc.py
@@ -100,6 +100,5 @@ module.add_function(name = "energies_on_bz_grid",
 ########################
 
 if __name__ == '__main__' :
-   module.generate_code(mako_template = sys.argv[1], wrap_file = sys.argv[2])
-   module.generate_py_converter_header(mako_template = sys.argv[3], wrap_file = sys.argv[4])
+   module.generate_code()
 
diff --git a/pytriqs/operators/operators2_desc.py b/pytriqs/operators/operators2_desc.py
index bd0f255f..27206b22 100644
--- a/pytriqs/operators/operators2_desc.py
+++ b/pytriqs/operators/operators2_desc.py
@@ -51,6 +51,5 @@ module.add_function(name = "c_dag", signature="many_body_operator<double>(int i,
 
 # to generate the module code
 if __name__ == '__main__' : 
-   module.generate_code(mako_template = sys.argv[1], wrap_file = sys.argv[2])
-   module.generate_py_converter_header(mako_template = sys.argv[3], wrap_file = sys.argv[4])
+   module.generate_code()
 
diff --git a/pytriqs/parameters/parameters_desc.py b/pytriqs/parameters/parameters_desc.py
index 8c2c551e..07f5f752 100644
--- a/pytriqs/parameters/parameters_desc.py
+++ b/pytriqs/parameters/parameters_desc.py
@@ -8,7 +8,8 @@ module.add_using("namespace triqs::params")
 # one class
 g = class_(
         py_type = "Parameters",
-        c_type = "triqs::params::parameters",
+        c_type = "parameters",
+        c_type_absolute = "triqs::params::parameters",
         #serializable= "tuple",
         is_printable= True,
         hdf5 = True,
@@ -35,6 +36,5 @@ g.add_setitem(signature = "void(const char * key, PyObject * ob)",
 module.add_class(g)
 
 if __name__ == '__main__' : 
-   module.generate_code(mako_template = sys.argv[1], wrap_file = sys.argv[2])
-   module.generate_py_converter_header(mako_template = sys.argv[3], wrap_file = sys.argv[4])
+   module.generate_code()
 
diff --git a/pytriqs/random_generator/random_generator_desc.py b/pytriqs/random_generator/random_generator_desc.py
index 5e894928..bf4e9213 100644
--- a/pytriqs/random_generator/random_generator_desc.py
+++ b/pytriqs/random_generator/random_generator_desc.py
@@ -40,7 +40,6 @@ module.add_function(name = "random_generator_names_list",
 ########################
 
 if __name__ == '__main__' :
-   module.generate_code(mako_template = sys.argv[1], wrap_file = sys.argv[2])
-   module.generate_py_converter_header(mako_template = sys.argv[3], wrap_file = sys.argv[4])
+   module.generate_code()
 
 
diff --git a/pytriqs/wrap_generator/py_converter_wrapper.mako.hpp b/pytriqs/wrap_generator/py_converter_wrapper.mako.hpp
index c7d3ab28..42a14214 100644
--- a/pytriqs/wrap_generator/py_converter_wrapper.mako.hpp
+++ b/pytriqs/wrap_generator/py_converter_wrapper.mako.hpp
@@ -1,5 +1,9 @@
 // Specialization of py_converter to types wrapped by the wrap_generator.
 // DO NOT EDIT. Generated automatically by wrap_generator
+// We store here the list of the C++ converted types for use in another module
+// WrappedTypeList
+// ${list(set(module.wrapped_types))}
+//
 #pragma once
 // in case it is included in the module ${module.full_name}.so, we do not want this specialization
 #ifndef TRIQS_PYTHON_WRAPPER_MODULE_${module.name}
diff --git a/pytriqs/wrap_generator/wrap_generator.py b/pytriqs/wrap_generator/wrap_generator.py
index 9b20438d..fbd61ff1 100644
--- a/pytriqs/wrap_generator/wrap_generator.py
+++ b/pytriqs/wrap_generator/wrap_generator.py
@@ -4,6 +4,11 @@ import os
 from mako.template import Template
 import importlib
 
+# the xxx_desc.py will always be called by cmake command, with the proper arguments
+# analyse sys.argv right now : we need it early for the use_module
+wrapper_mako, wrapper_target, header_mako, header_target = sys.argv[1:5]
+module_path_list = sys.argv[5:]
+
 # the correspondance c type -> py_type
 c_to_py_type = {'void' : 'None', 'int' : 'int', 'long' : 'int', 'double' : "float", "std::string" : "str"}
 
@@ -461,7 +466,7 @@ class module_ :
         - functions : dict : string -> function_. Modules functions. Key is the python name.
         - include_list : a list of files to include for compilation
     """
-    wrapped_types = {}
+    wrapped_types = []
 
     def __init__(self, full_name,  doc = '') : 
       self.full_name = full_name
@@ -474,12 +479,12 @@ class module_ :
       self.using =[]
       self.python_functions = {}
       self.hidden_python_functions = {}
-     
+      self.module_path_list = []
+
     def add_class(self, cls):
         if cls.py_type in self.classes : raise IndexError, "The class %s already exists"%cls.py_type
         self.classes[cls.py_type] = cls
-        self.wrapped_types[cls.c_type] = cls
-        self.wrapped_types[cls.c_type_absolute] = cls # we can call is by its name or its absolute name
+        self.wrapped_types += [cls.c_type, cls.c_type_absolute]  # we can call is by its name or its absolute name
 
     def add_function(self, **kw):
         if "name" in kw :
@@ -499,6 +504,30 @@ class module_ :
         else : 
             self.hidden_python_functions[name or f.__name__] = python_function(name or f.__name__, f)
 
+    def use_module(self,modulename) :
+        """ From the name of the module : 
+             - add the header file generated for this module to the include list
+             - read this file, extract the list of wrapped_types, and add it to
+               the wrapped_type list
+        """
+        f = None
+        print "argv", sys.argv
+        for path in module_path_list : 
+          hppfile = path + '/' +  modulename + '.hpp'
+          if os.path.exists(hppfile) : 
+              f = open(hppfile ,'r')
+              break
+        if not f : raise RuntimeError, "Can not find the module %s.\n  ... module_path_list = %s"%(modulename, self.module_path_list)
+
+        while f.readline().strip() != "// WrappedTypeList" : 
+            pass
+        l = f.readline()[3:] # // strip "// "
+        self.wrapped_types += eval(l)
+        self.add_include(hppfile)
+        print "Loading triqs wrapped module %s"%modulename
+        print " ...  found C++ header file %s"%hppfile
+        print " ...  found wrapped types %s"%l
+
     def add_include(self, *path) :
         self.include_list.extend(path)
 
@@ -527,7 +556,7 @@ class module_ :
         for n,f in class_.hidden_python_function.items() : 
             self.add_python_function(f,name = n, hidden=True)
 
-    def generate_code(self, mako_template, wrap_file) :
+    def generate_wrapper_code(self, mako_template, wrap_file) :
         self.prepare_for_generation()
         tpl = Template(filename=mako_template)
         rendered = tpl.render(module=self, regular_type_if_view_else_type= regular_type_if_view_else_type, is_type_a_view = is_type_a_view)
@@ -541,7 +570,8 @@ class module_ :
         with open(wrap_file,'w') as f:
            f.write(rendered)
 
-    #def generate_code_and_header(self, arglist) : 
-    #    self.generate_code(mako_template = arglist.argv[0], wrap_file = arglist.argv[1])
-    #    self.generate_py_converter_header(mako_template = arglist.argv[2], wrap_file = arglist.argv[3])
+    def generate_code(self) : 
+        self.generate_wrapper_code(mako_template = wrapper_mako, wrap_file = wrapper_target)
+        self.generate_py_converter_header(mako_template = header_mako, wrap_file = header_target)
  
+
diff --git a/pytriqs/wrap_test/CMakeLists.txt b/pytriqs/wrap_test/CMakeLists.txt
index 9444e69f..07caa349 100644
--- a/pytriqs/wrap_test/CMakeLists.txt
+++ b/pytriqs/wrap_test/CMakeLists.txt
@@ -13,6 +13,9 @@ triqs_python_extension(my_moduleB wrap_test)
 triqs_python_extension(test_g wrap_test)
 # ??triqs_set_rpath_for_target(my_module)
 
+# the module B must be generated AFTER my_module since it uses some wrapped types...
+add_dependencies(python_wrap_my_moduleB python_wrap_my_module)
+
 include_directories( ${CMAKE_CURRENT_SOURCE_DIR} )
 
 install (FILES ${CMAKE_SOURCE_DIR}/pytriqs/__init__.py.template DESTINATION "include/pytriqs/gf/local" RENAME __init__.py)
diff --git a/pytriqs/wrap_test/my_moduleB_desc.py b/pytriqs/wrap_test/my_moduleB_desc.py
index 88473050..f5e16506 100644
--- a/pytriqs/wrap_test/my_moduleB_desc.py
+++ b/pytriqs/wrap_test/my_moduleB_desc.py
@@ -2,11 +2,11 @@ from wrap_generator import *
 
 # The module
 mod = module_(full_name = "pytriqs.wrap_test.my_moduleB", doc = " Doc of my_module ")
+mod.use_module('my_module')
 mod.add_include("<triqs/../pytriqs/wrap_test/b.hpp>") 
 mod.add_include("<pytriqs/converters/my_module.hpp>")
 
 mod.add_function (name = "print_a2", signature = "void(A a)", doc = "DOC of print_a")
 
-mod.generate_code(mako_template = sys.argv[1], wrap_file = sys.argv[2])
-mod.generate_py_converter_header(mako_template = sys.argv[3], wrap_file = sys.argv[4])
+mod.generate_code()
 
diff --git a/pytriqs/wrap_test/my_module_desc.py b/pytriqs/wrap_test/my_module_desc.py
index 0f67d4e7..e58ded27 100644
--- a/pytriqs/wrap_test/my_module_desc.py
+++ b/pytriqs/wrap_test/my_module_desc.py
@@ -103,6 +103,5 @@ def f1(x,y):
 module.add_python_function(f1)
 
 if __name__ == '__main__' : 
-   module.generate_code(mako_template = sys.argv[1], wrap_file = sys.argv[2])
-   module.generate_py_converter_header(mako_template = sys.argv[3], wrap_file = sys.argv[4])
+   module.generate_code()
 
diff --git a/pytriqs/wrap_test/test_g_desc.py b/pytriqs/wrap_test/test_g_desc.py
index 599d66b6..23c20a36 100644
--- a/pytriqs/wrap_test/test_g_desc.py
+++ b/pytriqs/wrap_test/test_g_desc.py
@@ -13,6 +13,5 @@ module.add_function (name = "pass_sgf", signature = "void (gf_view<imfreq,scalar
 
 
 if __name__ == '__main__' : 
-   module.generate_code(mako_template = sys.argv[1], wrap_file = sys.argv[2])
-   module.generate_py_converter_header(mako_template = sys.argv[3], wrap_file = sys.argv[4])
+   module.generate_code()