Find an allready running instances of a thread and connect to it

[Roman]

Is it possible to to search for an allreay running instance of for example a thread and ''connect'' to it?
Something like this:

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    wnThread *th = find(wnThread);
    if(th = NULL){
        wnThread *th = new wnThread();
        th->start();
    }
    return a.exec();
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    wnThread *th = find(wnThread);
    if(th = NULL){
        wnThread *th = new wnThread();
        th->start();
    }
    return a.exec();
}

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I know about dde in Windows but i need a solution for independent operatingsystems.

Thanks