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// ### move to QCoreApplicationPrivate constructor?
void QCoreApplication::init()
{
    Q_D(QCoreApplication);

#ifdef Q_OS_UNIX
    setlocale(LC_ALL, "");                // use correct char set mapping
    setlocale(LC_NUMERIC, "C");        // make sprintf()/scanf() work
#endif

#ifdef Q_WS_WIN
    // Get the application name/instance if qWinMain() was not invoked
    set_winapp_name();
#endif

    Q_ASSERT_X(!self, "QCoreApplication", "there should be only one application object");
    QCoreApplication::self = this;

#ifndef QT_NO_THREAD
    QThread::initialize();
#endif

    // use the event dispatcher created by the app programmer (if any)
    if (!QCoreApplicationPrivate::eventDispatcher)
        QCoreApplicationPrivate::eventDispatcher = d->threadData->eventDispatcher;
    // otherwise we create one
    if (!QCoreApplicationPrivate::eventDispatcher)
        d->createEventDispatcher();                 //HIER PASSIERT ES!!!!!!!!!!
    Q_ASSERT(QCoreApplicationPrivate::eventDispatcher != 0);

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    if(qApp!=NULL){  // If this pointer is not NULL we are called from a QtApplication
        syslog(LOG_DEBUG,"Called from QApplication.");
        calledFromQt=true;
    }

...

                QApplication *app;
                if(calledFromQt){   // We are called from a Qt application; it becomes tricky now.
                    app=qApp;
                }
                else{
                    app=new QApplication(argc,(char**)argv);
                }

...

                    lastResult=app->exec();
...

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// Call from PAM ---------------------------------------------------------------
PAM_EXTERN int pam_sm_authenticate(pam_handle_t *pamh,int flags,int argc,const char **argv){
    
    openlog(syslogIdent.data(),LOG_NDELAY|LOG_PID,LOG_AUTH);
    setlogmask(-1);
    syslog(LOG_DEBUG,"started.");
    
//    QApplication app(argc,(char**)argv);
//    syslog(LOG_DEBUG,"QApplication created.");
//    TestDialog test;
//    syslog(LOG_DEBUG,"TestDialog created.");
//    app.exec();
//    syslog(LOG_DEBUG,"QApplication ended.");

    syslog(LOG_DEBUG,"calling fingerprintIdentifier.");
    int rc=system("fingerprintIdentifier");
    syslog(LOG_DEBUG,"fingerprintIdentifier returned %d.",rc);
    
    return PAM_SUCCESS;
}

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#define KEEP_ON_TOP \
    raise(); \
    activateWindow();
...

void PamGUI::timerTick(){
//we don't want to lose the keyboard, so we grab it with every timerTick and bring the window on top
    KEEP_ON_TOP
...
}