diff --git a/src/apdu_forward.rb b/src/apdu_forward.rb
index 83974ec..d6c71e4 100755
--- a/src/apdu_forward.rb
+++ b/src/apdu_forward.rb
@@ -19,7 +19,7 @@ along with sofSIM.  If not, see <http://www.gnu.org/licenses/>.
 Copyright (C) 2011 Kevin "tsaitgaist" Redon kevredon@mail.tsaitgaist.info
 =end
 # this programm will forward APDU from an IO to a SAP server
-require './sap/client.rb'
+require_relative 'sap/client'
 require 'socket'
 
 SAP_HOST = "localhost"
diff --git a/src/copy_client.rb b/src/copy_client.rb
index 528849f..4119e0f 100644
--- a/src/copy_client.rb
+++ b/src/copy_client.rb
@@ -18,8 +18,8 @@ along with sofSIM.  If not, see <http://www.gnu.org/licenses/>.
 Copyright (C) 2011 Kevin "tsaitgaist" Redon kevredon@mail.tsaitgaist.info
 =end
 # this class copies all files from the SIM to an xml file
-require './sap/client.rb'
-require './lib/apdu.rb'
+require_relative 'sap/client'
+require_relative 'lib/apdu'
 require 'xml'
 
 class Copy
diff --git a/src/demo_client.rb b/src/demo_client.rb
index 40cb1f3..947833f 100755
--- a/src/demo_client.rb
+++ b/src/demo_client.rb
@@ -19,10 +19,10 @@ along with sofSIM.  If not, see <http://www.gnu.org/licenses/>.
 Copyright (C) 2011 Kevin "tsaitgaist" Redon kevredon@mail.tsaitgaist.info
 =end
 # this programm will create a client which can be used to test servers
-require './sap/client.rb'
-require './lib/apdu.rb'
-require './info_client.rb'
-require './copy_client.rb'
+require_relative 'sap/client'
+require_relative 'lib/apdu'
+require_relative 'info_client'
+require_relative 'copy_client'
 
 #=============
 #== default ==
@@ -31,13 +31,13 @@ require './copy_client.rb'
 # client use (demo,info,copy)
 @type = "demo"
 # which IO to use (tcp,unix,bt)
-@socket = "tcp"
+@socket = "unix"
 # tcp port
 @port = 1337
 # tcp host
 @host = "localhost"
 # unix socket
-@unix = "/tmp/sap.socket"
+@unix = "/tmp/osmocom_sap"
 # file were to save the copy
 @file = "sim.xml"
 # bluetooth rfcomm serial port
@@ -131,7 +131,7 @@ when "bt"
   if @bt then
     io = SerialPort.new(@bt)
   else
-    require './tools/bluetooth_sap_serial.rb'
+    require_relative 'tools/bluetooth_sap_serial'
     bt = BluetoothSAPSerial.new
     # using SerialPort because reading the File does not work (have to find right stty options)
     io = SerialPort.new(bt.connect)
diff --git a/src/demo_server.rb b/src/demo_server.rb
index 207c804..e89b69d 100755
--- a/src/demo_server.rb
+++ b/src/demo_server.rb
@@ -27,11 +27,11 @@ Copyright (C) 2011 Kevin "tsaitgaist" Redon kevredon@mail.tsaitgaist.info
 # the server to use (pcsc,sim)
 @type = "pcsc"
 # which IO to use (tcp,unix)
-@socket = "tcp"
+@socket = "unix"
 # tcp port
 @port = 1337
 # unix socket
-@unix = "/tmp/sap.socket"
+@unix = "/tmp/osmocom_sap"
 # sim file
 @file = "sim.xml"
 # the verbosity (from common)
@@ -99,6 +99,10 @@ when "tcp"
   socket = TCPServer.new("0.0.0.0",@port)
 when "unix"
   require 'socket'
+  if File.exists?(@unix)
+    puts 'Previous socket exists, deleting it...'
+    File.delete(@unix)
+  end
   socket = UNIXServer.new(@unix)
 else
   raise "please defined which socket to use"
@@ -108,10 +112,10 @@ io = socket.accept
 
 case @type
 when "pcsc"
-  require './pcsc_server.rb'
+  require_relative 'pcsc_server'
   server = PCSCServer.new(io)
 when "sim"
-  require './simos_server.rb'
+  require_relative 'simos_server'
   server = SIMServer.new(io)
 else
   raise "unkown server type"
diff --git a/src/info_client.rb b/src/info_client.rb
index b1cda86..9a7ba2a 100644
--- a/src/info_client.rb
+++ b/src/info_client.rb
@@ -19,8 +19,8 @@ along with sofSIM.  If not, see <http://www.gnu.org/licenses/>.
 Copyright (C) 2011 Kevin "tsaitgaist" Redon kevredon@mail.tsaitgaist.info
 =end
 # this programm will display information stored in the SIM
-require './sap/client.rb'
-require './lib/apdu.rb'
+require_relative 'sap/client'
+require_relative 'lib/apdu'
 
 #=============
 #== methods ==
diff --git a/src/lib/apdu.rb b/src/lib/apdu.rb
index 5853efb..292755f 100644
--- a/src/lib/apdu.rb
+++ b/src/lib/apdu.rb
@@ -19,11 +19,7 @@ along with sofSIM.  If not, see <http://www.gnu.org/licenses/>.
 
 Copyright (C) 2011 Kevin "tsaitgaist" Redon kevredon@mail.tsaitgaist.info
 =end
-# this librarie is to centralise the APDU related work
-
-# required by ruby 1.8, but brakes 1.9
-#$KCODE = 'UTF8'
-#require 'jcode'
+# this library is to centralise the APDU related work
 
 # transform binary string into readable hex string
 class String
diff --git a/src/pcsc_server.rb b/src/pcsc_server.rb
index 4a802e9..ab3820d 100644
--- a/src/pcsc_server.rb
+++ b/src/pcsc_server.rb
@@ -18,7 +18,7 @@ along with sofSIM.  If not, see <http://www.gnu.org/licenses/>.
 
 Copyright (C) 2011 Kevin "tsaitgaist" Redon kevredon@mail.tsaitgaist.info
 =end
-require './sap/server.rb'
+require_relative 'sap/server'
 require 'rubygems'
 require 'smartcard'
 =begin
diff --git a/src/sap/client.rb b/src/sap/client.rb
index e89cc07..9eaed0a 100644
--- a/src/sap/client.rb
+++ b/src/sap/client.rb
@@ -19,7 +19,7 @@ Copyright (C) 2011 Kevin "tsaitgaist" Redon kevredon@mail.tsaitgaist.info
 =end
 # this is the client part of the SAP
 # it implements the state machine for the client
-require './sap/common.rb'
+require_relative 'common'
 
 # this is an abstract class
 # TODO :
diff --git a/src/sap/server.rb b/src/sap/server.rb
index f93ac5a..cebdbda 100644
--- a/src/sap/server.rb
+++ b/src/sap/server.rb
@@ -20,7 +20,7 @@ Copyright (C) 2011 Kevin "tsaitgaist" Redon kevredon@mail.tsaitgaist.info
 # this is the server part of the SAP
 # it implements the state machine for the server
 # this is an abstract class
-require './sap/common.rb'
+require_relative 'common'
 
 # this is an bastract class
 # TODO (not implemented) :
diff --git a/src/simos_server.rb b/src/simos_server.rb
index fe6eb26..3c7a52a 100644
--- a/src/simos_server.rb
+++ b/src/simos_server.rb
@@ -18,8 +18,8 @@ along with sofSIM.  If not, see <http://www.gnu.org/licenses/>.
 
 Copyright (C) 2011 Kevin "tsaitgaist" Redon kevredon@mail.tsaitgaist.info
 =end
-require './sap/server.rb'
-require './lib/apdu.rb'
+require_relative 'sap/server'
+require_relative 'lib/apdu'
 require 'socket'
 require 'xml'