Библиотека Qt

...
#include <QWebView>
#include "ui_autoheroeswm.h"
#include "frmAccounts.h"

class AutoHeroesWM : public QMainWindow
{
    Q_OBJECT

public:
    AutoHeroesWM(QWidget *parent = 0);
    ~AutoHeroesWM();

public slots:
    void isLoadComplete();

private:
    Ui::AutoHeroesWMClass ui;

    void launchAccounts(bool fStart = true);
    QString toUtf8(char *objectName, char *txt);
    void openPage(QString url);

    ...
    QWebView *webView;
    ...
};

#include "autoheroeswm.h"

AutoHeroesWM::AutoHeroesWM(QWidget *parent)
    : QMainWindow(parent)
{
    ui.setupUi(this);

    launchAccounts();
    webView = new QWebView(this);
    hLayout = new QHBoxLayout;
    vLayout = new QVBoxLayout;
    lblAddress = new QLabel(toUtf8("lblAddress", "Адрес страницы:"));
    txtAddress = new QLineEdit;
    lblStatus = new QLabel("");
    mainPage = "http://!@#$%.ru/";
    loginPage = mainPage + "login.php";

    hLayout->addWidget(lblAddress);
    hLayout->addWidget(txtAddress);

    vLayout->addLayout(hLayout);
    vLayout->addWidget(webView);

    webView->page()->setLinkDelegationPolicy(QWebPage::DelegateAllLinks);

    ui.statusbar->addWidget(lblStatus);

    ui.centralwidget->setLayout(vLayout);

    //openPage(mainPage); // !
}

...

void AutoHeroesWM::launchAccounts(bool fStart)
{
    frmAccounts dlgAccounts(this);

    if(dlgAccounts.exec())
    {
        sLogin = dlgAccounts.getLogin();
        sPassword = dlgAccounts.getPassword();
    }

    if (!sLogin.isEmpty())
    {
        setWindowTitle("AutoHeroesWM [L: " + sLogin + "]");
        //openPage(loginPage); // !!
    }
    else
    {
        setWindowTitle("AutoHeroesWM [Need Auth]");
        openPage(mainPage);
        //openPage(mainPage); // !!!
    }
}

...

void AutoHeroesWM::openPage(QString url)
{
    webView->load(QUrl(url));
}