diff --git a/windows/alpc.py b/windows/alpc.py
index 8d36291..15cd2ed 100644
--- a/windows/alpc.py
+++ b/windows/alpc.py
@@ -292,7 +292,7 @@ class MessageAttribute(gdef.ALPC_MESSAGE_ATTRIBUTES):
 AlpcSection = namedtuple("AlpcSection", ["handle", "size"])
 
 class AlpcTransportBase(object):
-    def send_receive(self, alpc_message, receive_msg=None, flags=gdef.ALPC_MSGFLG_SYNC_REQUEST):
+    def send_receive(self, alpc_message, receive_msg=None, flags=gdef.ALPC_MSGFLG_SYNC_REQUEST, timeout=None):
         """Send and receive a message with ``flags``.
 
             :param alpc_message: The message to send. If ``alpc_message`` is a :class:`str` it build an AlpcMessage with the message as data.
@@ -309,7 +309,7 @@ class AlpcTransportBase(object):
         if receive_msg is None:
             receive_msg = AlpcMessage(0x1000)
         receive_size = gdef.SIZE_T(receive_msg.port_message_buffer_size)
-        winproxy.NtAlpcSendWaitReceivePort(self.handle, flags, alpc_message.port_message, alpc_message.attributes, receive_msg.port_message, receive_size, receive_msg.attributes, None)
+        winproxy.NtAlpcSendWaitReceivePort(self.handle, flags, alpc_message.port_message, alpc_message.attributes, receive_msg.port_message, receive_size, receive_msg.attributes, timeout)
         return receive_msg
 
     def send(self, alpc_message, flags=0):
@@ -408,7 +408,6 @@ class AlpcClient(AlpcTransportBase):
         else:
             raise ValueError("Don't know how to send <{0!r}> as connect message".format(connect_message))
 
-        # windows.utils.print_ctypes_struct(port_attr, "port_attr_connect", hexa=True)
         receive_attr = MessageAttribute.with_all_attributes()
         winproxy.NtAlpcConnectPort(handle, port_name_unicode, obj_attr, port_attr, flags, None, send_msg, buffersize, send_msg_attr, receive_attr, timeout)
         # If send_msg is not None, it contains the ClientId.UniqueProcess : PID of the server :)
@@ -433,7 +432,8 @@ class AlpcClient(AlpcTransportBase):
         return view_attributes
 
     def disconnect(self):
-        self._close_port(self.handle)
+        if self.handle:
+            self._close_port(self.handle)
 
     def __del__(self):
         if sys.path is not None:
@@ -447,6 +447,7 @@ class AlpcServer(AlpcTransportBase):
     def __init__(self, port_name=None):
         self.port_name = None
         self.communication_port_list = []
+        self.handle = None
         if port_name is not None:
             self.create_port(port_name)
 
@@ -526,7 +527,8 @@ class AlpcServer(AlpcTransportBase):
         return msg
 
     def disconnect(self):
-        self._close_port(self.handle)
+        if self.handle:
+            self._close_port(self.handle)
         for com_port_handle in self.communication_port_list:
             self._close_port(com_port_handle)
 
diff --git a/windows/com.py b/windows/com.py
index 10a0f47..ba67de7 100644
--- a/windows/com.py
+++ b/windows/com.py
@@ -12,6 +12,9 @@ from windows.generated_def import RPC_C_IMP_LEVEL_IMPERSONATE, CLSCTX_INPROC_SER
 from windows.generated_def import interfaces
 from windows.generated_def.interfaces import generate_IID, IID
 
+# We have    windows.com.COMImplementation
+# So we need windows.com.COMInterface
+COMInterface = interfaces.COMInterface
 
 # Simple raw -> UUID
 # "-".join("{:02X}".format(c) for c in struct.unpack("<IHHHBBBBBB", x))
@@ -34,7 +37,10 @@ def create_instance(clsiid, targetinterface, custom_iid=None, context=CLSCTX_INP
     """A simple wrapper around ``CoCreateInstance <https://msdn.microsoft.com/en-us/library/windows/desktop/ms686615(v=vs.85).aspx>``"""
     if custom_iid is None:
         custom_iid = targetinterface.IID
-    return winproxy.CoCreateInstance(byref(clsiid), None, context, byref(custom_iid), byref(targetinterface))
+    if isinstance(clsiid, basestring):
+        clsiid = IID.from_string(clsiid)
+    winproxy.CoCreateInstance(byref(clsiid), None, context, byref(custom_iid), byref(targetinterface))
+    return targetinterface
 
 
 def resolve_progid(progid):
diff --git a/windows/winobject/process.py b/windows/winobject/process.py
index 0ce793b..3cb271c 100644
--- a/windows/winobject/process.py
+++ b/windows/winobject/process.py
@@ -471,6 +471,11 @@ class Process(utils.AutoHandle):
 
     token = property(open_token, doc="The process :class:`~windows.winobject.token.Token`")
 
+    @property # Document ?
+    def handles(self):
+        pid = self.pid
+        return [h for h in windows.system.handles if h.dwProcessId == pid]
+
     def __del__(self):
         super(Process, self).__del__()
         # Same logic that AutoHandle.__del__ for Process.limited_handle