diff --git a/CHANGED b/CHANGED
index d42ae0d5d..abfd6ce33 100644
--- a/CHANGED
+++ b/CHANGED
@@ -536,4 +536,5 @@
   - bugfix:  loosing data when sending FS20 messages in a group
   - bugfix:  better handling of disconnected CUN
   - feature: softfhtbuffer added to CUL
-  - bugfix: pgm3: Pulldown-Menu without selected FHTDEV not possible any more
+  - bugfix:  pgm3: Pulldown-Menu without selected FHTDEV not possible any more
+  - feature: duplicate buffer added for multi-cul/-fhz setups
diff --git a/FHEM/00_CUL.pm b/FHEM/00_CUL.pm
index b463dd2d6..b84c94866 100755
--- a/FHEM/00_CUL.pm
+++ b/FHEM/00_CUL.pm
@@ -73,7 +73,7 @@ CUL_Initialize($)
   $hash->{GetFn}   = "CUL_Get";
   $hash->{SetFn}   = "CUL_Set";
   $hash->{StateFn} = "CUL_SetState";
-  $hash->{AttrList}= "do_not_notify:1,0 dummy:1,0 filtertimeout " .
+  $hash->{AttrList}= "do_not_notify:1,0 dummy:1,0 " .
                      "showtime:1,0 model:CUL,CUR loglevel:0,1,2,3,4,5,6 " . 
                      "CUR_id_list fhtsoftbuffer:1,0";
   $hash->{ShutdownFn} = "CUL_Shutdown";
@@ -573,6 +573,8 @@ CUL_Write($$$)
 
   } elsif($fn eq "04" && substr($msg,0,6) eq "010101") {   # FS20
     $fn = "F";
+    AddDuplicate($hash->{NAME},
+                "0101a001" . substr($msg, 6, 6) . "00" . substr($msg, 12));
     $msg = substr($msg,6);
 
   } elsif($fn eq "04" && substr($msg,0,6) eq "020183") {   # FHT
@@ -759,8 +761,9 @@ CUL_Read($)
     if($foundp) {
       foreach my $d (@{$foundp}) {
         next if(!$defs{$d});
-        $defs{$d}{RSSI} = $rssi if($rssi);
+        $defs{$d}{"RSSI_$name"} = $rssi if($rssi);
         $defs{$d}{RAWMSG} = $rmsg;
+        $defs{$d}{"MSGCNT_$name"}++;
       }
     }
 
diff --git a/FHEM/00_FHZ.pm b/FHEM/00_FHZ.pm
index 893a33c84..f99dfbb95 100755
--- a/FHEM/00_FHZ.pm
+++ b/FHEM/00_FHZ.pm
@@ -79,7 +79,7 @@ FHZ_Initialize($)
   $hash->{GetFn}   = "FHZ_Get";
   $hash->{SetFn}   = "FHZ_Set";
   $hash->{StateFn} = "FHZ_SetState";
-  $hash->{AttrList}= "do_not_notify:1,0 dummy:1,0 filtertimeout repeater:1,0 " .
+  $hash->{AttrList}= "do_not_notify:1,0 dummy:1,0 " .
                    "showtime:1,0 model:fhz1000,fhz1300 loglevel:0,1,2,3,4,5,6 ".
                    "fhtsoftbuffer:1,0";
 }
@@ -542,6 +542,16 @@ FHZ_Write($$$)
     return;
   }
 
+  ###############
+  # insert value into the msghist. At the moment this only makes sense for FS20
+  # devices. As the transmitted value differs from the received one, we have to
+  # recompute.
+  if($fn eq "04" && substr($msg,0,6) eq "010101") {
+    AddDuplicate($hash->{NAME},
+                "0101a001" . substr($msg, 6, 6) . "00" . substr($msg, 12));
+  }
+
+
   my $bstring = FHZ_CompleteMsg($fn, $msg);
   Log 5, "Sending " . unpack('H*', $bstring);
 
@@ -689,6 +699,7 @@ FHZ_Read($)
         foreach my $d (@{$foundp}) {
           next if(!$defs{$d});
           $defs{$d}{RAWMSG} = $dmsg;
+          $defs{$d}{"MSGCNT_$name"}++;
         }
       }
 
diff --git a/FHEM/09_BS.pm b/FHEM/09_BS.pm
index 620a9e4bc..ccf9ef441 100644
--- a/FHEM/09_BS.pm
+++ b/FHEM/09_BS.pm
@@ -89,8 +89,6 @@ BS_Parse($$)
 
   my $name= $def->{NAME};
 
-  return "" if($def->{IODev} && $def->{IODev}{NAME} ne $hash->{NAME});
-
   my $t= TimeNow();
 
   my $flags= hex(substr($msg, 24, 1)) & 0xdc;
diff --git a/FHEM/09_USF1000.pm b/FHEM/09_USF1000.pm
index d88feb982..658ea1d7f 100644
--- a/FHEM/09_USF1000.pm
+++ b/FHEM/09_USF1000.pm
@@ -98,9 +98,6 @@ USF1000_Parse($$)
   my $def= $defptr{$dev};
   my $name= $def->{NAME};
 
-  return "" if($def->{IODev} && $def->{IODev}{NAME} ne $hash->{NAME});
-
-
   my $t= TimeNow();
 
   # Msg format:
diff --git a/FHEM/10_FS20.pm b/FHEM/10_FS20.pm
index 34058a2ef..0923b6352 100755
--- a/FHEM/10_FS20.pm
+++ b/FHEM/10_FS20.pm
@@ -354,7 +354,6 @@ FS20_Parse($$)
     my @list;
     foreach my $n (keys %{ $def }) {
       my $lh = $def->{$n};
-      return "" if($lh->{IODev} && $lh->{IODev}{NAME} ne $hash->{NAME});
       $lh->{CHANGED}[0] = $v;
       $lh->{STATE} = $v;
       $lh->{READINGS}{state}{TIME} = TimeNow();
diff --git a/FHEM/11_FHT.pm b/FHEM/11_FHT.pm
index 0b42c85e4..4e6b6ee46 100755
--- a/FHEM/11_FHT.pm
+++ b/FHEM/11_FHT.pm
@@ -167,8 +167,6 @@ FHT_Set($@)
     if($a[$i] eq "time") {
       my @t = localtime;
       splice(@a,$i,1,("hour",$t[2],"minute",$t[1]));
-      IOWrite($hash, "", sprintf("T04%x", $t[0]))                # CUL hack
-                  if($hash->{IODev} && $hash->{IODev}->{TYPE} eq "CUL");
     }
   }
 
@@ -348,8 +346,6 @@ FHT_Parse($$)
   my $def = $defptr{$dev};
   my $name = $def->{NAME};
 
-  return "" if($def->{IODev} && $def->{IODev}{NAME} ne $hash->{NAME});
-
   # Short message
   if(length($msg) < 26)  {
     Log 4,"FHT Short message. Device $name, Message: $msg";
diff --git a/FHEM/12_HMS.pm b/FHEM/12_HMS.pm
index b8c4f30ba..d2afa224d 100755
--- a/FHEM/12_HMS.pm
+++ b/FHEM/12_HMS.pm
@@ -106,7 +106,6 @@ HMS_Parse($$)
   }
 
   my $def = $defptr{$dev};
-  return "" if($def->{IODev} && $def->{IODev}{NAME} ne $hash->{NAME});
 
   my (@v, @txt);
 
diff --git a/FHEM/13_KS300.pm b/FHEM/13_KS300.pm
index a1815393f..3ceaa739b 100755
--- a/FHEM/13_KS300.pm
+++ b/FHEM/13_KS300.pm
@@ -89,8 +89,6 @@ KS300_Parse($$)
     my $haverain = 0;
     my $name= $def->{NAME};
 
-    return "" if($def->{IODev} && $def->{IODev}{NAME} ne $hash->{NAME});
-
     my @v;
     my @txt = ( "rain_raw", "rain", "wind", "humidity", "temperature",
                 "israining", "unknown1", "unknown2", "unknown3");
diff --git a/FHEM/14_CUL_WS.pm b/FHEM/14_CUL_WS.pm
index 10ea89fab..2bb1e805e 100755
--- a/FHEM/14_CUL_WS.pm
+++ b/FHEM/14_CUL_WS.pm
@@ -95,10 +95,6 @@ CUL_WS_Parse($$)
     return "UNDEFINED CUL_WS: $cde";
   }
 
-  # It's not our device
-  return "" if($def->{IODev} && $def->{IODev}{NAME} ne $hash->{NAME});
-
-
   my $tm=TimeNow();
   $hash = $def;
  
diff --git a/FHEM/15_CUL_EM.pm b/FHEM/15_CUL_EM.pm
index 3e602a61e..6096e3040 100755
--- a/FHEM/15_CUL_EM.pm
+++ b/FHEM/15_CUL_EM.pm
@@ -107,7 +107,6 @@ CUL_EM_Parse($$)
 
   if($defptr{$cde}) {
     my $def = $defptr{$cde};
-    return "" if($def->{IODev} && $def->{IODev}{NAME} ne $hash->{NAME});
 
     $hash = $defptr{$cde};
 
diff --git a/FHEM/20_X10.pm b/FHEM/20_X10.pm
index e6c102293..985f74d26 100755
--- a/FHEM/20_X10.pm
+++ b/FHEM/20_X10.pm
@@ -348,7 +348,6 @@ X10_Parse($$)
   foreach my $unitcode (@unitcodes) {
     my $h= $devices{$housecode}{$unitcode};
     if($h) {
-        return "" if($h->{IODev} && $h->{IODev}{NAME} ne $hash->{NAME});
         my $name= $h->{NAME};
         $h->{CHANGED}[0] = $value;
         $h->{STATE} = $value;
diff --git a/HISTORY b/HISTORY
index 2d78bb16a..ccebbd7ec 100644
--- a/HISTORY
+++ b/HISTORY
@@ -431,8 +431,16 @@
   - bugfix: missing blank in attribute list for FHT; exclude report from lazy
   - typos and anchors in documentation corrected
 
- - Sun Oct11 2009 (Boris)
+- Sun Oct 11 2009 (Boris)
   - finalized 09_BS.pm and documentation
 
-- Tue Nov10 2009 (Martin Haas)
- - Bugfix: pgm3: Pulldown-Menu without selected FHTDEV not possible any more
+- Tue Nov 10 2009 (Martin Haas)
+  - Bugfix: pgm3: Pulldown-Menu without selected FHTDEV not possible any more
+
+- Thu Nov 12 2009 (Rudi)
+  - The duplicate pool added. The check routine is called from the Dispatch
+    routine (so it will affecc CUL/FHZ and CM11), and for FS20 calls from
+    the CUL and FHZ Write function.
+    Duplicates within 0.5 seconds are filtered if they are not reported by the
+    same IO Unit. Existing check for IODev removed from BS USF1000 FS20 FHT HMS
+    KS300 CUL_WS CUL_EM X10.
diff --git a/TODO b/TODO
index 558de035e..4effbef11 100644
--- a/TODO
+++ b/TODO
@@ -1,11 +1,6 @@
 FHEM:
-- RAWTIME
-
-- Remote serial device via IP (for the FHZ1300 WLAN)
-- Common buffer for parallel use of two devices: CUL+FHZ, (WS300/EM1000PC?)
 - fhem-to-fhem module
 - CUR built-in MENU creation support
-- Remove or reimplement repeater attribute (cul/fhz/doc)
 
 Webpgm2
 - plot data from multiple files in a single picture
diff --git a/fhem.pl b/fhem.pl
index 8c45888ea..d5df6260b 100755
--- a/fhem.pl
+++ b/fhem.pl
@@ -39,12 +39,14 @@ use Time::HiRes qw(gettimeofday);
 ##################################################
 # Forward declarations
 #
+sub AddDuplicate($$);
 sub AnalyzeCommand($$);
 sub AnalyzeCommandChain($$);
 sub AnalyzeInput($);
 sub AssignIoPort($);
 sub CallFn(@);
 sub CommandChain($$);
+sub CheckDuplicate($$);
 sub DoClose($);
 sub Dispatch($$);
 sub FmtDateTime($);
@@ -151,7 +153,9 @@ my %defaultattr;    		# Default attributes
 my %intAt;			# Internal at timer hash.
 my $nextat;                     # Time when next timer will be triggered.
 my $intAtCnt=0;
-my $cvsid = '$Id: fhem.pl,v 1.81 2009-11-08 14:18:06 rudolfkoenig Exp $';
+my %duplicate;                  # Pool of received msg for multi-fhz/cul setups
+my $duplidx=0;                  # helper for the above pool
+my $cvsid = '$Id: fhem.pl,v 1.82 2009-11-12 19:08:00 rudolfkoenig Exp $';
 my $namedef =
   "where <name> is either:\n" .
   "- a single device name\n" .
@@ -175,7 +179,7 @@ $modules{_internal_}{AttrFn} = "GlobalAttr";
   "?"       => { Fn=>"CommandHelp",
 	    Hlp=>",get this help" },
   "attr" => { Fn=>"CommandAttr",
-            Hlp=>"<devspec> <attrname> [<attrval>],set attribute for <devspec>" },
+           Hlp=>"<devspec> <attrname> [<attrval>],set attribute for <devspec>"},
   "define"  => { Fn=>"CommandDefine",
 	    Hlp=>"<name> <type> <options>,define a device/at/notify entity" },
   "deleteattr" => { Fn=>"CommandDeleteAttr",
@@ -2041,6 +2045,9 @@ Dispatch($$)
 
   Log 5, "$name dispatch $dmsg";
 
+  my ($isdup, $idx) = CheckDuplicate($name, $dmsg);
+  return $duplicate{$idx}{FND} if($isdup);
+
   my @found;
   my $last_module;
   foreach my $m (sort { $modules{$a}{ORDER} cmp $modules{$b}{ORDER} }
@@ -2056,6 +2063,7 @@ Dispatch($$)
     $last_module = $m;
     last if(int(@found));
   }
+
   if(!int(@found)) {
     my $h = $iohash->{MatchList};
     if(defined($h)) {
@@ -2088,6 +2096,44 @@ Dispatch($$)
       DoTrigger($found, undef);
     }
   }
+  $duplicate{$idx}{FND} = \@found;
 
   return \@found;
 }
+
+sub
+CheckDuplicate($$)
+{
+  my ($ioname, $msg) = @_;
+
+  # Store only the "relevant" part, as the CUL won't compute the checksum
+  $msg = substr($msg, 8) if($msg =~ m/^81/ && length($msg) > 8);
+
+  my $now = gettimeofday();
+  my $lim = $now-0.5;
+
+  foreach my $oidx (keys %duplicate) {
+    if($duplicate{$oidx}{TIM} < $lim) {
+      delete($duplicate{$oidx});
+
+    } elsif($duplicate{$oidx}{MSG} eq $msg &&
+            $duplicate{$oidx}{ION} ne $ioname) {
+      return (1, $oidx);
+
+    }
+  }
+  $duplicate{$duplidx}{ION} = $ioname;
+  $duplicate{$duplidx}{MSG} = $msg;
+  $duplicate{$duplidx}{TIM} = $now;
+  $duplidx++;
+  return (0, $duplidx-1);
+}
+
+sub
+AddDuplicate($$)
+{
+  $duplicate{$duplidx}{ION} = shift;
+  $duplicate{$duplidx}{MSG} = shift;
+  $duplicate{$duplidx}{TIM} = gettimeofday();
+  $duplidx++;
+}