public class Tab : System.MarshalByRefObject 

public static int Execute(Instance instance, IZennoPosterProjectModel project)
{
    // clear cookie
    instance.ClearCookie();
    
    // go to lessons.zennolab.com
    Tab tab = instance.ActiveTab;
    if ((tab.IsVoid) || (tab.IsNull)) return -1;
    if (tab.IsBusy) tab.WaitDownloading();
    tab.Navigate("lessons.zennolab.com");
    if (tab.IsBusy) tab.WaitDownloading();
    
    // go to zennolab.com in new tab
    Tab tb = instance.NewTab("zennolab");
    tb.Navigate("zennolab.com");
    if (tb.IsBusy) tb.WaitDownloading();
    
    // get source text
    string text = tab.GetSourceText("utf-8");
    
    // close tab
    tab.Close();
    
    // set source text
    tb.SetSourceText(text);
    
    return 0;
}

public static function Execute($instance, $project)
{
    // clear cookie
    $instance->ClearCookie();
    
    // go to lessons.zennolab.com
    $tab = $instance->ActiveTab;
    if (($tab.->sVoid) || ($tab->IsNull)) return -1;
    if ($tab->IsBusy) $tab->WaitDownloading();
    $tab->Navigate("lessons.zennolab.com");
    if ($tab->IsBusy) $tab->WaitDownloading();
    
    // go to zennolab.com in new tab
    $tb = $instance->NewTab("zennolab");
    $tb->Navigate("zennolab.com");
    if ($tb->IsBusy) $tb->WaitDownloading();
    
    // get source text
    $text = $tab->GetSourceText("utf-8");
    
    // close tab
    $tab->Close();
    
    // set source text
    $tb->SetSourceText($text);
    
    return 0;
}