I have a quick question. I created a QPushButton called extapp_btn.
Now I want to connect it with an external app. In my example bellow
I push the button and notepad.exe should start.

How can I connect them?

-example code ----------------------------------

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QWebView>
#include <QUrl>
#include <QPushButton>
#include <QProcess>

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
ui->webView->load(QUrl("http://localhost"));

QPushButton * extapp_btn = new QPushButton(this);
extapp_btn->setGeometry(540,440,93,27);
extapp_btn->setText("External App");

QProcess *proc = new QProcess (this);
// proc->start ("notepad.exe");

QObject::connect(extapp_btn_btn,SIGNAL(clicked()),qApp,SLOT( START EXTERNAL APP ));

}

MainWindow::~MainWindow()
{
delete ui;
}