diff --git a/kdecore/kaccel.h b/kdecore/kaccel.h
index 3d9dacf0a..7bdf9e0e7 100644
--- a/kdecore/kaccel.h
+++ b/kdecore/kaccel.h
@@ -90,7 +90,7 @@ class KAccelPrivate;
  * @see KKeyDialog
  */
 
-class KDECORE_EXPORT KAccel : public QAccel
+class KDECORE_EXPORT KAccel : public TQAccel
 {
 	Q_OBJECT
  public:
diff --git a/kdecore/kapplication.cpp b/kdecore/kapplication.cpp
index ed302875a..bdee53c29 100644
--- a/kdecore/kapplication.cpp
+++ b/kdecore/kapplication.cpp
@@ -457,7 +457,7 @@ bool KApplication::notify(TQObject *receiver, TQEvent *event)
     if ((t == TQEvent::AccelOverride) || (t == TQEvent::KeyPress))
     {
        static const KShortcut& _selectAll = KStdAccel::selectAll();
-       TQLineEdit *edit = ::qt_cast<TQLineEdit *>(receiver);
+       TQLineEdit *edit = tqqt_cast<TQLineEdit *>(receiver);
        if (edit)
        {
           // We have a keypress for a lineedit...
@@ -495,7 +495,7 @@ bool KApplication::notify(TQObject *receiver, TQEvent *event)
 
           }
        }
-       TQTextEdit *medit = ::qt_cast<TQTextEdit *>(receiver);
+       TQTextEdit *medit = tqqt_cast<TQTextEdit *>(receiver);
        if (medit)
        {
           // We have a keypress for a multilineedit...
@@ -2009,13 +2009,13 @@ TQPalette KApplication::createApplicationPalette( KConfig *config, int contrast_
     TQColor kde34VisitedLink( 82, 24, 139 );
 
     TQColor background = config->readColorEntry( "background", &kde34Background );
-    TQColor foreground = config->readColorEntry( "foreground", &black );
+    TQColor foreground = config->readColorEntry( "foreground", tqblackptr );
     TQColor button = config->readColorEntry( "buttonBackground", &kde34Button );
-    TQColor buttonText = config->readColorEntry( "buttonForeground", &black );
+    TQColor buttonText = config->readColorEntry( "buttonForeground", tqblackptr );
     TQColor highlight = config->readColorEntry( "selectBackground", &kde34Blue );
-    TQColor highlightedText = config->readColorEntry( "selectForeground", &white );
-    TQColor base = config->readColorEntry( "windowBackground", &white );
-    TQColor baseText = config->readColorEntry( "windowForeground", &black );
+    TQColor highlightedText = config->readColorEntry( "selectForeground", tqwhiteptr );
+    TQColor base = config->readColorEntry( "windowBackground", tqwhiteptr );
+    TQColor baseText = config->readColorEntry( "windowForeground", tqblackptr );
     TQColor link = config->readColorEntry( "linkColor", &kde34Link );
     TQColor visitedLink = config->readColorEntry( "visitedLinkColor", &kde34VisitedLink );
 
@@ -2447,14 +2447,14 @@ void KApplication::invokeMailer(const TQString &_to, const TQString &_cc, const
        // put the whole address lists into RFC2047 encoded blobs; technically
        // this isn't correct, but KMail understands it nonetheless
        to = TQString( "=?utf8?b?%1?=" )
-            .arg( KCodecs::base64Encode( _to.utf8(), false ) );
+            .arg( QString(KCodecs::base64Encode( _to.utf8(), false )) );
      }
      if ( !_cc.isEmpty() )
        cc = TQString( "=?utf8?b?%1?=" )
-            .arg( KCodecs::base64Encode( _cc.utf8(), false ) );
+            .arg( QString(KCodecs::base64Encode( _cc.utf8(), false )) );
      if ( !_bcc.isEmpty() )
        bcc = TQString( "=?utf8?b?%1?=" )
-             .arg( KCodecs::base64Encode( _bcc.utf8(), false ) );
+             .arg( QString(KCodecs::base64Encode( _bcc.utf8(), false )) );
    } else {
      to = _to;
      cc = _cc;
@@ -2608,7 +2608,7 @@ void KApplication::broadcastKeyCode(unsigned int keyCode)
   emit coreFakeKeyPress(keyCode);
 }
 
-QCString
+TQCString
 KApplication::launcher()
 {
    return "klauncher";
diff --git a/kdecore/kcharsets.cpp b/kdecore/kcharsets.cpp
index f4ae826f5..52cf87849 100644
--- a/kdecore/kcharsets.cpp
+++ b/kdecore/kcharsets.cpp
@@ -372,13 +372,13 @@ TQChar KCharsets::fromEntity(const TQString &str)
     TQChar res = TQChar::null;
 
     int pos = 0;
-    if(str[pos] == '&') pos++;
+    if(str[pos] == (QChar)'&') pos++;
 
     // Check for '&#000' or '&#x0000' sequence
-    if (str[pos] == '#' && str.length()-pos > 1) {
+    if (str[pos] == (QChar)'#' && str.length()-pos > 1) {
         bool ok;
         pos++;
-        if (str[pos] == 'x' || str[pos] == 'X') {
+        if (str[pos] == (QChar)'x' || str[pos] == (QChar)'X') {
             pos++;
             // '&#x0000', hexadeciaml character reference
             TQString tmp(str.unicode()+pos, str.length()-pos);
@@ -412,7 +412,7 @@ TQChar KCharsets::fromEntity(const TQString &str, int &len)
     {
         TQString tmp = str.left(len);
         TQChar res = fromEntity(tmp);
-        if( res != TQChar::null ) return res;
+        if( res != (QChar)TQChar::null ) return res;
         len--;
     }
     return TQChar::null;
@@ -437,13 +437,13 @@ TQString KCharsets::resolveEntities( const TQString &input )
     for ( ; p < end; ++p ) {
         const TQChar ch = *p;
 
-        if ( ch == '&' ) {
+        if ( ch == (QChar)'&' ) {
             ampersand = p;
             scanForSemicolon = true;
             continue;
         }
 
-        if ( ch != ';' || scanForSemicolon == false )
+        if ( ch != (QChar)';' || scanForSemicolon == false )
             continue;
 
         assert( ampersand );
diff --git a/kdecore/kcmdlineargs.cpp b/kdecore/kcmdlineargs.cpp
index 3e70156cd..9600da39c 100644
--- a/kdecore/kcmdlineargs.cpp
+++ b/kdecore/kcmdlineargs.cpp
@@ -91,7 +91,7 @@ protected:
 
 };
 
-class KCmdLineParsedArgs : public QStrList
+class KCmdLineParsedArgs : public TQStrList
 {
 public:
    KCmdLineParsedArgs()
@@ -483,7 +483,7 @@ KCmdLineArgs::findOption(const char *_opt, TQCString opt, int &i, bool _enabled,
             {
                argument = _opt+p;
             }
-            args->setOption(singleCharOption, argument);
+            args->setOption(singleCharOption, (const char*)argument);
             return;
          }
          break; // Unknown argument
@@ -525,7 +525,7 @@ KCmdLineArgs::findOption(const char *_opt, TQCString opt, int &i, bool _enabled,
          }
          argument = argv[i];
       }
-      args->setOption(opt, argument);
+      args->setOption(opt, (const char*)argument);
    }
    else
    {
@@ -924,7 +924,7 @@ KCmdLineArgs::usage(const char *id)
             name = name.mid(1);
             if ((name[0] == '[') && (name[name.length()-1] == ']'))
          name = name.mid(1, name.length()-2);
-            printQ(optionFormatString.arg(name, -25)
+            printQ(optionFormatString.arg(QString(name), -25)
      .arg(description));
          }
          else
@@ -948,12 +948,12 @@ KCmdLineArgs::usage(const char *id)
                opt = opt + name;
                if (!option->def)
                {
-                  printQ(optionFormatString.arg(opt, -25)
+                  printQ(optionFormatString.arg(QString(opt), -25)
                          .arg(description));
                }
                else
                {
-                  printQ(optionFormatStringDef.arg(opt, -25)
+                  printQ(optionFormatStringDef.arg(QString(opt), -25)
                          .arg(description).arg(option->def));
                }
                opt = "";
@@ -1113,7 +1113,7 @@ KCmdLineArgs::setOption(const TQCString &opt, const char *value)
    parsedOptionList->insert( opt, new TQCString(value) );
 }
 
-QCString
+TQCString
 KCmdLineArgs::getOption(const char *_opt) const
 {
    TQCString *value = 0;
diff --git a/kdecore/kconfigbase.cpp b/kdecore/kconfigbase.cpp
index 3c80e5710..771e9b643 100644
--- a/kdecore/kconfigbase.cpp
+++ b/kdecore/kconfigbase.cpp
@@ -927,7 +927,7 @@ TQColor KConfigBase::readColorEntry( const char *pKey,
   TQString aValue = readEntry( pKey );
   if( !aValue.isEmpty() )
     {
-      if ( aValue.at(0) == '#' )
+      if ( aValue.at(0) == (QChar)'#' )
         {
           aRetColor.setNamedColor(aValue);
         }
@@ -1358,7 +1358,7 @@ void KConfigBase::writeEntry ( const char *pKey, const TQStrList &list,
         }
       str_list += sep;
     }
-  if( str_list.at(str_list.length() - 1) == sep )
+  if( str_list.at(str_list.length() - 1) == (QChar)sep )
     str_list.truncate( str_list.length() -1 );
   writeEntry( pKey, str_list, bPersistent, bGlobal, bNLS );
 }
@@ -1402,7 +1402,7 @@ void KConfigBase::writeEntry ( const char *pKey, const TQStringList &list,
         }
       str_list += sep;
     }
-  if( str_list.at(str_list.length() - 1) == sep )
+  if( str_list.at(str_list.length() - 1) == (QChar)sep )
     str_list.truncate( str_list.length() -1 );
   writeEntry( pKey, str_list, bPersistent, bGlobal, bNLS, bExpand );
 }
diff --git a/kdecore/kdebug.cpp b/kdecore/kdebug.cpp
index 38e45daf6..2370d406f 100644
--- a/kdecore/kdebug.cpp
+++ b/kdecore/kdebug.cpp
@@ -282,7 +282,7 @@ static void kDebugBackend( unsigned short nLevel, unsigned int nArea, const char
           break;
       }
       TQFile aOutputFile( kDebug_data->config->readPathEntry(aKey, "kdebug.dbg") );
-      aOutputFile.open( IO_WriteOnly | IO_Append | IO_Raw );
+      aOutputFile.open( (QIODevice::OpenModeFlag)((int)IO_WriteOnly | (int)IO_Append | (int)IO_Raw) );
       aOutputFile.writeBlock( buf, strlen( buf ) );
       aOutputFile.close();
       break;
@@ -292,7 +292,7 @@ static void kDebugBackend( unsigned short nLevel, unsigned int nArea, const char
       // Since we are in kdecore here, we cannot use KMsgBox and use
       // TQMessageBox instead
       if ( !kDebug_data->aAreaName.isEmpty() )
-          aCaption += TQString("(%1)").arg( kDebug_data->aAreaName );
+          aCaption += TQString("(%1)").arg( QString(kDebug_data->aAreaName) );
       TQMessageBox::warning( 0L, aCaption, data, i18n("&OK") );
       break;
   }
@@ -376,7 +376,7 @@ kdbgstream& kdbgstream::operator << (TQChar ch)
     output += "\\x" + TQString::number( ch.unicode(), 16 ).rightJustify(2, '0');
   else {
     output += ch;
-    if (ch == '\n') flush();
+    if (ch == (QChar)'\n') flush();
   }
   return *this;
 }
@@ -415,7 +415,7 @@ kdbgstream& kdbgstream::operator << (const TQWidget* widget)
       return *this;
     }
   output += string;
-  if (output.at(output.length() -1 ) == '\n')
+  if (output.at(output.length() -1 ) == (QChar)'\n')
     {
       flush();
     }
diff --git a/kdecore/kiconeffect.cpp b/kdecore/kiconeffect.cpp
index cf0095ca9..8315eab6b 100644
--- a/kdecore/kiconeffect.cpp
+++ b/kdecore/kiconeffect.cpp
@@ -520,8 +520,8 @@ void KIconEffect::semiTransparent(TQPixmap &pix)
     }
 
     TQImage img;
-    if (pix.mask() != 0L)
-	img = pix.mask()->convertToImage();
+    if (pix.tqmask() != 0L)
+	img = pix.tqmask()->convertToImage();
     else
     {
 	img.create(pix.size(), 1, 2, TQImage::BigEndian);
diff --git a/kdecore/kidna.cpp b/kdecore/kidna.cpp
index c7e1ccdb5..ca41fecdf 100644
--- a/kdecore/kidna.cpp
+++ b/kdecore/kidna.cpp
@@ -41,7 +41,7 @@ TQCString KIDNA::toAsciiCString(const TQString &idna)
 
 TQString KIDNA::toAscii(const TQString &idna)
 {
-  if (idna.length() && (idna[0] == "."))
+  if (idna.length() && (idna[0] == (QChar)'.'))
   {
      TQString host = TQString::fromLatin1(toAsciiCString(idna.mid(1)));
      if (host.isEmpty())
@@ -54,7 +54,7 @@ TQString KIDNA::toAscii(const TQString &idna)
 TQString KIDNA::toUnicode(const TQString &idna)
 {
 #ifndef Q_WS_WIN //TODO kresolver not ported
-  if (idna.length() && (idna[0] == "."))
+  if (idna.length() && (idna[0] == (QChar)'.'))
      return idna[0] + KResolver::domainToUnicode(idna.mid(1));
   return KResolver::domainToUnicode(idna);
 #else
diff --git a/kdecore/klibloader.cpp b/kdecore/klibloader.cpp
index 61155e7c9..e2f55fe67 100644
--- a/kdecore/klibloader.cpp
+++ b/kdecore/klibloader.cpp
@@ -422,7 +422,7 @@ KLibrary* KLibLoader::library( const char *name )
 #ifndef NDEBUG
         kdDebug(150) << "library=" << name << ": No file named " << libname << " found in paths." << endl;
 #endif
-        d->errorMessage = i18n("Library files for \"%1\" not found in paths.").arg(libname);
+        d->errorMessage = i18n("Library files for \"%1\" not found in paths.").arg(TQString(libname));
         return 0;
       }
 
diff --git a/kdecore/klocale.cpp b/kdecore/klocale.cpp
index f8a82e3f5..810103e9f 100644
--- a/kdecore/klocale.cpp
+++ b/kdecore/klocale.cpp
@@ -1212,34 +1212,34 @@ static void _inc_by_one(TQString &str, int position)
       switch(last_char)
 	{
 	case '0':
-	  str[i] = '1';
+	  str[i] = (QChar)'1';
 	  break;
 	case '1':
-	  str[i] = '2';
+	  str[i] = (QChar)'2';
 	  break;
 	case '2':
-	  str[i] = '3';
+	  str[i] = (QChar)'3';
 	  break;
 	case '3':
-	  str[i] = '4';
+	  str[i] = (QChar)'4';
 	  break;
 	case '4':
-	  str[i] = '5';
+	  str[i] = (QChar)'5';
 	  break;
 	case '5':
-	  str[i] = '6';
+	  str[i] = (QChar)'6';
 	  break;
 	case '6':
-	  str[i] = '7';
+	  str[i] = (QChar)'7';
 	  break;
 	case '7':
-	  str[i] = '8';
+	  str[i] = (QChar)'8';
 	  break;
 	case '8':
-	  str[i] = '9';
+	  str[i] = (QChar)'9';
 	  break;
 	case '9':
-	  str[i] = '0';
+	  str[i] = (QChar)'0';
 	  if (i == 0) str.prepend('1');
 	  continue;
 	case '.':
@@ -1304,8 +1304,8 @@ TQString KLocale::formatNumber(const TQString &numStr, bool round,
 
   
   // Skip the sign (for now)
-  bool neg = (tmpString[0] == '-');
-  if (neg  ||  tmpString[0] == '+') tmpString.remove(0, 1);
+  bool neg = (tmpString[0] == (QChar)'-');
+  if (neg  ||  tmpString[0] == (QChar)'+') tmpString.remove(0, 1);
 
   // Split off exponential part (including 'e'-symbol)
   TQString mantString = tmpString.section('e', 0, 0,
@@ -1345,7 +1345,7 @@ TQString KLocale::formatDate(const TQDate &pDate, bool shortFormat) const
     {
       if ( !escape )
 	{
-	  if ( rst.at( format_index ).unicode() == '%' )
+	  if ( (QChar)(rst.at( format_index ).unicode()) == (QChar)'%' )
 	    escape = true;
 	  else
 	    buffer.append(rst.at(format_index));
@@ -1466,7 +1466,7 @@ double KLocale::readNumber(const TQString &_str, bool * ok) const
   }
 
   TQString tot;
-  if (neg) tot = '-';
+  if (neg) tot = (QChar)'-';
 
   tot += major + '.' + minor + exponentialPart;
 
@@ -1496,7 +1496,7 @@ double KLocale::readMoney(const TQString &_str, bool * ok) const
   // (with a special case for parenthesis)
   if (negativeMonetarySignPosition() == ParensAround)
     {
-      if (str[0] == '(' && str[str.length()-1] == ')')
+      if (str[0] == (QChar)'(' && str[str.length()-1] == (QChar)')')
         {
 	  neg = true;
 	  str.remove(str.length()-1,1);
@@ -1563,7 +1563,7 @@ double KLocale::readMoney(const TQString &_str, bool * ok) const
   }
 
   TQString tot;
-  if (neg) tot = '-';
+  if (neg) tot = (QChar)'-';
   tot += major + '.' + minior;
   return tot.toDouble(ok);
 }
@@ -1620,7 +1620,7 @@ TQDate KLocale::readDate(const TQString &intstr, const TQString &fmt, bool* ok)
 
     TQChar c = fmt.at(fmtpos++);
 
-    if (c != '%') {
+    if (c != (QChar)'%') {
       if (c.isSpace() && str.at(strpos).isSpace())
         strpos++;
       else if (c != str.at(strpos++))
@@ -1642,7 +1642,7 @@ TQDate KLocale::readDate(const TQString &intstr, const TQString &fmt, bool* ok)
           error = true;
 	  j = 1;
 	  while (error && (j < 8)) {
-	    TQString s = calendar()->weekDayName(j, c == 'a').lower();
+	    TQString s = calendar()->weekDayName(j, c == (QChar)'a').lower();
 	    int len = s.length();
 	    if (str.mid(strpos, len) == s)
             {
@@ -1659,7 +1659,7 @@ TQDate KLocale::readDate(const TQString &intstr, const TQString &fmt, bool* ok)
 	  if (d->nounDeclension && d->dateMonthNamePossessive) {
 	    j = 1;
 	    while (error && (j < 13)) {
-	      TQString s = calendar()->monthNamePossessive(j, year, c == 'b').lower();
+	      TQString s = calendar()->monthNamePossessive(j, year, c == (QChar)'b').lower();
 	      int len = s.length();
 	      if (str.mid(strpos, len) == s) {
 	        month = j;
@@ -1671,7 +1671,7 @@ TQDate KLocale::readDate(const TQString &intstr, const TQString &fmt, bool* ok)
 	  }
 	  j = 1;
 	  while (error && (j < 13)) {
-	    TQString s = calendar()->monthName(j, year, c == 'b').lower();
+	    TQString s = calendar()->monthName(j, year, c == (QChar)'b').lower();
 	    int len = s.length();
 	    if (str.mid(strpos, len) == s) {
 	      month = j;
@@ -1760,7 +1760,7 @@ TQTime KLocale::readTime(const TQString &intstr, ReadTimeFlags flags, bool *ok)
 
       TQChar c = Format.at(Formatpos++);
 
-      if (c != '%')
+      if (c != (QChar)'%')
 	{
 	  if (c.isSpace())
 	    strpos++;
@@ -1869,7 +1869,7 @@ TQString KLocale::formatTime(const TQTime &pTime, bool includeSecs, bool isDurat
     {
       if ( !escape )
 	{
-	  if ( rst.at( format_index ).unicode() == '%' )
+	  if ( (QChar)(rst.at( format_index ).unicode()) == (QChar)'%' )
 	    escape = true;
 	  else
 	    buffer[index++] = rst.at( format_index );
@@ -1879,7 +1879,7 @@ TQString KLocale::formatTime(const TQTime &pTime, bool includeSecs, bool isDurat
 	  switch ( rst.at( format_index ).unicode() )
 	    {
 	    case '%':
-	      buffer[index++] = '%';
+	      buffer[index++] = (QChar)'%';
 	      break;
 	    case 'H':
 	      put_it_in( buffer, index, pTime.hour() );
@@ -1908,7 +1908,7 @@ TQString KLocale::formatTime(const TQTime &pTime, bool includeSecs, bool isDurat
 	      number = pTime.hour();
 	    case 'l':
 	      // to share the code
-	      if ( rst.at( format_index ).unicode() == 'l' )
+	      if ( (QChar)(rst.at( format_index ).unicode()) == (QChar)'l' )
 		number = isDuration ? pTime.hour() : (pTime.hour() + 11) % 12 + 1;
 	      if ( number / 10 )
 		buffer[index++] = number / 10 + '0';
diff --git a/kdecore/kmacroexpander.cpp b/kdecore/kmacroexpander.cpp
index 3c421574e..5516c1b61 100644
--- a/kdecore/kmacroexpander.cpp
+++ b/kdecore/kmacroexpander.cpp
@@ -55,7 +55,7 @@ void KMacroExpanderBase::expandMacros( TQString &str )
     TQString rsts;
 
     for (pos = 0; pos < str.length(); ) {
-        if (ec != (char)0) {
+        if (ec != (QChar)0) {
             if (str.unicode()[pos] != ec)
                 goto nohit;
             if (!(len = expandEscapedMacro( str, pos, rst )))
@@ -110,7 +110,7 @@ bool KMacroExpanderBase::expandMacrosShellQuote( TQString &str, uint &pos )
 
     while (pos < str.length()) {
         TQChar cc( str.unicode()[pos] );
-        if (ec != (char)0) {
+        if (ec != (QChar)0) {
             if (cc != ec)
                 goto nohit;
             if (!(len = expandEscapedMacro( str, pos, rst )))
@@ -315,7 +315,7 @@ static TQStringList &operator+=( TQStringList &s, const TQString &n) { s << n; r
 static bool
 isIdentifier( uint c )
 {
-    return c == (QChar)'_' || (c >= (QChar)'A' && c <= (QChar)'Z') || (c >= (QChar)'a' && c <= (QChar)'z') || (c >= (QChar)'0' && c <= (QChar)'9');
+    return c == '_' || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9');
 }
 
 ////////
diff --git a/kdecore/kmimesourcefactory.h b/kdecore/kmimesourcefactory.h
index ce91ee0f8..536ead0b8 100644
--- a/kdecore/kmimesourcefactory.h
+++ b/kdecore/kmimesourcefactory.h
@@ -37,7 +37,7 @@ class KInstance;
  *
  * @author Peter Putzer <putzer@kde.org>
  */
-class KDECORE_EXPORT KMimeSourceFactory : public QMimeSourceFactory
+class KDECORE_EXPORT KMimeSourceFactory : public TQMimeSourceFactory
 {
 public:
 
diff --git a/kdecore/kmultipledrag.h b/kdecore/kmultipledrag.h
index 85a0a66a3..47bfbd378 100644
--- a/kdecore/kmultipledrag.h
+++ b/kdecore/kmultipledrag.h
@@ -51,7 +51,7 @@ class KMultipleDragPrivate;
  *
  * @author David Faure <faure@kde.org>
  */
-class KDECORE_EXPORT KMultipleDrag : public QDragObject
+class KDECORE_EXPORT KMultipleDrag : public TQDragObject
 {
     Q_OBJECT
 
diff --git a/kdecore/kpalette.cpp b/kdecore/kpalette.cpp
index 49cacc79b..bc446367a 100644
--- a/kdecore/kpalette.cpp
+++ b/kdecore/kpalette.cpp
@@ -65,10 +65,10 @@ KPalette::KPalette(const TQString &name)
 
   // Read first line
   // Expected "GIMP Palette"
-  if (paletteFile.readLine(line, maxLength) == -1) return;
+  if (paletteFile.readLine(line.ascii(), maxLength) == -1) return;
   if (line.find(" Palette") == -1) return;
 
-  while( paletteFile.readLine(line, maxLength) != -1)
+  while( paletteFile.readLine(line.ascii(), maxLength) != -1)
   {
      if (line[0] == '#') 
      {
diff --git a/kdecore/kprocio.cpp b/kdecore/kprocio.cpp
index 15a2f70bc..9159edab5 100644
--- a/kdecore/kprocio.cpp
+++ b/kdecore/kprocio.cpp
@@ -104,7 +104,7 @@ bool KProcIO::start (RunMode runmode, bool includeStderr)
 
 bool KProcIO::writeStdin (const TQString &line, bool appendnewline)
 {
-  return writeStdin(codec->fromUnicode(line), appendnewline);
+  return writeStdin(TQCString(codec->fromUnicode(line)), appendnewline);
 }
 
 bool KProcIO::writeStdin (const TQCString &line, bool appendnewline)
diff --git a/kdecore/krandomsequence.cpp b/kdecore/krandomsequence.cpp
index 8e4c88297..04240733f 100644
--- a/kdecore/krandomsequence.cpp
+++ b/kdecore/krandomsequence.cpp
@@ -217,7 +217,7 @@ KRandomSequence::getBool()
   return (((unsigned long) m_lngShufflePos) & 1);  
 }
 
-class KRandomSequenceList : public QGList
+class KRandomSequenceList : public TQGList
 {
   friend class KRandomSequence;
 public:
diff --git a/kdecore/krfcdate.cpp b/kdecore/krfcdate.cpp
index fc57bc2d3..d9a374d0c 100644
--- a/kdecore/krfcdate.cpp
+++ b/kdecore/krfcdate.cpp
@@ -394,7 +394,7 @@ KRFCDate::parseDateISO8601( const TQString& input_ )
   mday   = l[2].toUInt();
 
   // Z suffix means UTC.
-  if ('Z' == timeString.at(timeString.length() - 1)) {
+  if ((QChar)'Z' == timeString.at(timeString.length() - 1)) {
     timeString.remove(timeString.length() - 1, 1);
   }
 
diff --git a/kdecore/ksavefile.cpp b/kdecore/ksavefile.cpp
index 77b0a6b41..16887a677 100644
--- a/kdecore/ksavefile.cpp
+++ b/kdecore/ksavefile.cpp
@@ -171,7 +171,7 @@ bool KSaveFile::backupFile( const TQString& qFilename, const TQString& backupDir
        else
 	   nameOnly = cFilename.mid(slash + 1);
        cBackup = TQFile::encodeName(backupDir);
-       if ( backupDir[backupDir.length()-1] != '/' )
+       if ( backupDir[backupDir.length()-1] != (QChar)'/' )
            cBackup += '/';
        cBackup += nameOnly;
    }
diff --git a/kdecore/kshortcutmenu.cpp b/kdecore/kshortcutmenu.cpp
index 399096877..3df389f07 100644
--- a/kdecore/kshortcutmenu.cpp
+++ b/kdecore/kshortcutmenu.cpp
@@ -84,14 +84,14 @@ void KShortcutMenu::keyPressEvent( TQKeyEvent* pEvent )
 	KKey key( pEvent );
 	
 	switch( pEvent->key() ) {
-	 case Key_Shift:
-	 case Key_Control:
-	 case Key_Alt:
-	 case Key_Meta:
-	 case Key_Super_L:
-	 case Key_Super_R:
-	 case Key_Hyper_L:
-	 case Key_Hyper_R:
+	 case TQ_Key_Shift:
+	 case TQ_Key_Control:
+	 case TQ_Key_Alt:
+	 case TQ_Key_Meta:
+	 case TQ_Key_Super_L:
+	 case TQ_Key_Super_R:
+	 case TQ_Key_Hyper_L:
+	 case TQ_Key_Hyper_R:
 		break;
 	 default:
 		int iItem = searchForKey( key );
diff --git a/kdecore/kshortcutmenu.h b/kdecore/kshortcutmenu.h
index 10f486094..aa641e201 100644
--- a/kdecore/kshortcutmenu.h
+++ b/kdecore/kshortcutmenu.h
@@ -32,7 +32,7 @@ class KAccelActions;
 /**
  * @internal
  */
-class KDECORE_EXPORT KShortcutMenu : public QPopupMenu
+class KDECORE_EXPORT KShortcutMenu : public TQPopupMenu
 {
 	Q_OBJECT
  public:
diff --git a/kdecore/kstandarddirs.cpp b/kdecore/kstandarddirs.cpp
index 6ec8eb1bc..f64acbd90 100644
--- a/kdecore/kstandarddirs.cpp
+++ b/kdecore/kstandarddirs.cpp
@@ -189,7 +189,7 @@ void KStandardDirs::addPrefix( const TQString& _dir, bool priority )
 	return;
 
     TQString dir = _dir;
-    if (dir.at(dir.length() - 1) != '/')
+    if (dir.at(dir.length() - 1) != (QChar)'/')
 	dir += '/';
 
     if (!prefixes.contains(dir)) {
@@ -209,7 +209,7 @@ void KStandardDirs::addXdgConfigPrefix( const TQString& _dir, bool priority )
 	return;
 
     TQString dir = _dir;
-    if (dir.at(dir.length() - 1) != '/')
+    if (dir.at(dir.length() - 1) != (QChar)'/')
 	dir += '/';
 
     if (!d->xdgconf_prefixes.contains(dir)) {
@@ -229,7 +229,7 @@ void KStandardDirs::addXdgDataPrefix( const TQString& _dir, bool priority )
 	return;
 
     TQString dir = _dir;
-    if (dir.at(dir.length() - 1) != '/')
+    if (dir.at(dir.length() - 1) != (QChar)'/')
 	dir += '/';
 
     if (!d->xdgdata_prefixes.contains(dir)) {
@@ -271,7 +271,7 @@ bool KStandardDirs::addResourceType( const char *type,
 	relatives.insert(type, rels);
     }
     TQString copy = relativename;
-    if (copy.at(copy.length() - 1) != '/')
+    if (copy.at(copy.length() - 1) != (QChar)'/')
 	copy += '/';
     if (!rels->contains(copy)) {
         if (priority)
@@ -301,7 +301,7 @@ bool KStandardDirs::addResourceDir( const char *type,
 	absolutes.insert(type, paths);
     }
     TQString copy = absdir;
-    if (copy.at(copy.length() - 1) != '/')
+    if (copy.at(copy.length() - 1) != (QChar)'/')
       copy += '/';
 
     if (!paths->contains(copy)) {
@@ -452,7 +452,7 @@ bool KStandardDirs::exists(const TQString &fullPath)
 {
     KDE_struct_stat buff;
     if (access(TQFile::encodeName(fullPath), R_OK) == 0 && KDE_stat( TQFile::encodeName(fullPath), &buff ) == 0)
-	if (fullPath.at(fullPath.length() - 1) != '/') {
+	if (fullPath.at(fullPath.length() - 1) != (QChar)'/') {
 	    if (S_ISREG( buff.st_mode ))
 		return true;
 	} else
@@ -478,9 +478,9 @@ static void lookupDirectory(const TQString& path, const TQString &relPart,
       return;
 
 #ifdef Q_WS_WIN
-    assert(path.at(path.length() - 1) == '/' || path.at(path.length() - 1) == '\\');
+    assert(path.at(path.length() - 1) == (QChar)'/' || path.at(path.length() - 1) == (QChar)'\\');
 #else
-    assert(path.at(path.length() - 1) == '/');
+    assert(path.at(path.length() - 1) == (QChar)'/');
 #endif
 
     struct dirent *ep;
@@ -492,7 +492,7 @@ static void lookupDirectory(const TQString& path, const TQString &relPart,
     while( ( ep = readdir( dp ) ) != 0L )
     {
       TQString fn( TQFile::decodeName(ep->d_name));
-      if (fn == _dot || fn == _dotdot || fn.at(fn.length() - 1).latin1() == '~')
+      if (fn == _dot || fn == _dotdot || (TQCString)(fn.at(fn.length() - 1).latin1()) == (QChar)'~')
 	continue;
 
       if (!recursive && !regexp.exactMatch(fn))
@@ -569,9 +569,9 @@ static void lookupPrefix(const TQString& prefix, const TQString& relpath,
     if (prefix.isEmpty()) //for sanity
       return;
 #ifdef Q_WS_WIN
-    assert(prefix.at(prefix.length() - 1) == '/' || prefix.at(prefix.length() - 1) == '\\');
+    assert(prefix.at(prefix.length() - 1) == (QChar)'/' || prefix.at(prefix.length() - 1) == (QChar)'\\');
 #else
-    assert(prefix.at(prefix.length() - 1) == '/');
+    assert(prefix.at(prefix.length() - 1) == (QChar)'/');
 #endif
     KDE_struct_stat buff;
 
@@ -591,7 +591,7 @@ static void lookupPrefix(const TQString& prefix, const TQString& relpath,
 	while( ( ep = readdir( dp ) ) != 0L )
 	    {
 		TQString fn( TQFile::decodeName(ep->d_name));
-		if (fn == _dot || fn == _dotdot || fn.at(fn.length() - 1) == '~')
+		if (fn == _dot || fn == _dotdot || fn.at(fn.length() - 1) == (QChar)'~')
 		    continue;
 
 		if ( !pathExp.exactMatch(fn) )
@@ -692,7 +692,7 @@ KStandardDirs::realPath(const TQString &dirname)
     if (realpath( TQFile::encodeName(dirname).data(), realpath_buffer) != 0) {
         // success, use result from realpath
         int len = strlen(realpath_buffer);
-        realpath_buffer[len] = '/';
+        realpath_buffer[len] = (QChar)'/';
         realpath_buffer[len+1] = 0;
         return TQFile::decodeName(realpath_buffer);
     }
@@ -771,7 +771,7 @@ void KStandardDirs::createSpecialResource(const char *type)
    if (result > 0)
    {
       link[result] = 0;
-      if (link[0] == '/')
+      if (link[0] == (int)'/')
          dir = TQFile::decodeName(link);
       else
          dir = TQDir::cleanDirPath(dir+TQFile::decodeName(link));
@@ -892,7 +892,7 @@ TQStringList KStandardDirs::systemPaths( const TQString& pstr )
     {
 	p = tokens[ i ];
 
-        if ( p[ 0 ] == '~' )
+        if ( p[ 0 ] == (QChar)'~' )
         {
             int len = p.find( '/' );
             if ( len == -1 )
@@ -1167,7 +1167,7 @@ bool KStandardDirs::makeDir(const TQString& dir, int mode)
     uint len = target.length();
 
     // append trailing slash if missing
-    if (dir.at(len - 1) != '/')
+    if (dir.at(len - 1) != (QChar)'/')
         target += '/';
 
     TQString base("");
@@ -1220,7 +1220,7 @@ static TQString executablePrefix()
    if (length == -1)
       return TQString::null;
 
-   path_buffer[length] = '\0';
+   path_buffer[length] = (QChar)'\0';
 
    TQString path = TQFile::decodeName(path_buffer);
 
@@ -1314,7 +1314,7 @@ void KStandardDirs::addKDEDefaults()
     TQString localKdeDir = readEnvPath(getuid() ? "KDEHOME" : "KDEROOTHOME");
     if (!localKdeDir.isEmpty())
     {
-       if (localKdeDir[localKdeDir.length()-1] != '/')
+       if (localKdeDir[localKdeDir.length()-1] != (QChar)'/')
           localKdeDir += '/';
     }
     else
@@ -1358,7 +1358,7 @@ void KStandardDirs::addKDEDefaults()
     TQString localXdgDir = readEnvPath("XDG_CONFIG_HOME");
     if (!localXdgDir.isEmpty())
     {
-       if (localXdgDir[localXdgDir.length()-1] != '/')
+       if (localXdgDir[localXdgDir.length()-1] != (QChar)'/')
           localXdgDir += '/';
     }
     else
@@ -1390,7 +1390,7 @@ void KStandardDirs::addKDEDefaults()
            it != kdedirList.end(); ++it)
         {
            TQString dir = *it;
-           if (dir[dir.length()-1] != '/')
+           if (dir[dir.length()-1] != (QChar)'/')
              dir += '/';
            xdgdirList.append(dir+"share/");
         }
@@ -1402,7 +1402,7 @@ void KStandardDirs::addKDEDefaults()
     localXdgDir = readEnvPath("XDG_DATA_HOME");
     if (!localXdgDir.isEmpty())
     {
-       if (localXdgDir[localXdgDir.length()-1] != '/')
+       if (localXdgDir[localXdgDir.length()-1] != (QChar)'/')
           localXdgDir += '/';
     }
     else
diff --git a/kdecore/kstartupinfo.cpp b/kdecore/kstartupinfo.cpp
index 40f06127e..673e5e6ab 100644
--- a/kdecore/kstartupinfo.cpp
+++ b/kdecore/kstartupinfo.cpp
@@ -1140,9 +1140,9 @@ TQString KStartupInfoData::to_text() const
         ret += TQString::fromLatin1( " DESKTOP=%1" )
             .arg( d->desktop == NET::OnAllDesktops ? NET::OnAllDesktops : d->desktop - 1 ); // spec counts from 0
     if( !d->wmclass.isEmpty())
-        ret += TQString::fromLatin1( " WMCLASS=\"%1\"" ).arg( d->wmclass );
+        ret += TQString::fromLatin1( " WMCLASS=\"%1\"" ).arg( QString(d->wmclass) );
     if( !d->hostname.isEmpty())
-        ret += TQString::fromLatin1( " HOSTNAME=%1" ).arg( d->hostname );
+        ret += TQString::fromLatin1( " HOSTNAME=%1" ).arg( QString(d->hostname) );
     for( TQValueList< pid_t >::ConstIterator it = d->pids.begin();
          it != d->pids.end();
          ++it )
@@ -1466,7 +1466,7 @@ static
 TQString get_str( const TQString& item_P )
     {
     unsigned int pos = item_P.find( '=' );
-    if( item_P.length() > pos + 2 && item_P[ pos + 1 ] == '\"' )
+    if( item_P.length() > pos + 2 && item_P[ pos + 1 ] == (QChar)'\"' )
         {
         int pos2 = item_P.left( pos + 2 ).find( '\"' );
         if( pos2 < 0 )
@@ -1522,8 +1522,8 @@ static TQString escape_str( const TQString& str_P )
 	 pos < str_P.length();
 	 ++pos )
 	{
-	if( str_P[ pos ] == '\\'
-	    || str_P[ pos ] == '"' )
+	if( str_P[ pos ] == (QChar)'\\'
+	    || str_P[ pos ] == (QChar)'"' )
 	    ret += '\\';
 	ret += str_P[ pos ];
 	}
diff --git a/kdecore/kstringhandler.cpp b/kdecore/kstringhandler.cpp
index 6f786d904..3184c18e2 100644
--- a/kdecore/kstringhandler.cpp
+++ b/kdecore/kstringhandler.cpp
@@ -419,8 +419,8 @@ bool KStringHandler::matchFileName( const TQString& filename, const TQString& pa
       return false;
 
    // Patterns like "Makefile*"
-   if ( pattern[ pattern_len - 1 ] == '*' && len + 1 >= pattern_len ) {
-      if ( pattern[ 0 ] == '*' )
+   if ( pattern[ pattern_len - 1 ] == (QChar)'*' && len + 1 >= pattern_len ) {
+      if ( pattern[ 0 ] == (QChar)'*' )
       {
          return filename.find(pattern.mid(1, pattern_len - 2)) != -1;
       }
@@ -434,7 +434,7 @@ bool KStringHandler::matchFileName( const TQString& filename, const TQString& pa
    }
 
    // Patterns like "*~", "*.extension"
-   if ( pattern[ 0 ] == '*' && len + 1 >= pattern_len )
+   if ( pattern[ 0 ] == (QChar)'*' && len + 1 >= pattern_len )
    {
      const TQChar *c1 = pattern.unicode() + pattern_len - 1;
      const TQChar *c2 = filename.unicode() + len - 1;
diff --git a/kdecore/kurldrag.h b/kdecore/kurldrag.h
index fd911dfb7..eb1f9522a 100644
--- a/kdecore/kurldrag.h
+++ b/kdecore/kurldrag.h
@@ -41,7 +41,7 @@ class KURLDragPrivate;
  * To create a drag object, use the KURLDrag constructor.
  * To handle drops, use TQUriDrag::canDecode() and KURLDrag::decode()
  */
-class KDECORE_EXPORT KURLDrag : public QUriDrag
+class KDECORE_EXPORT KURLDrag : public TQUriDrag
 {
 public:
   /**