This event occurs when a new window is to be created for displaying a resource. 

Some actions that can cause this include the user shift-clicking on a link, the user right-clicking on a link and choosing "open in new window," or a targeted navigation to a frame name that does not yet exist. 

Your browser application can also trigger this event by calling the Navigate or Navigate2 method with the navOpenInNewWindow flag. 

The TEmbeddedWB control has an opportunity to handle the new window creation itself.
If it does not, a top-level Internet Explorer window is created as a separate (nonhosted) process.

The TEmbeddedWB can manipulate this event to prevent the window from open or, open it in the application itself. This includes every kind of delphi application (SDI, MDI, and tabbed browsing)

Command Arguments:
procedure TForm1.EmbeddedWB1NewWindow2(Sender: TObject;
var ppDisp: IDispatch; var Cancel: WordBool);

Sender

ppDisp

Optional - can use to provide a new WebBrowser object to use for the new window. If left unchanged then a new Internet Explorer window will be created.

Cancel

Set true to cancel the new window, False to allow the new window to open.
The TWebBrowser component for which the event is being generated. Usage: (Sender as TWebBrowser)

ppDisp

An object expression that, optionally, receives a new, hidden Webbrowser or Internet Explorer object with no URL loaded.

Cancel

A Boolean value that, when set to TRUE, is used to cancel the navigation.

Set Value of Cancel=TRUE to disable displaying of a new window.
Set ppDisp to EmbeddedWb.Application of the webbrowser you want the url to be displayed in:


Example of new window simple Vcl form:

procedure TForm1.EmbeddedWB1NewWindow2(ASender: TObject; var ppDisp: IDispatch;
  var Cancel: WordBool);
var
   NewApp: TForm1;
begin
   NewApp := TForm1.Create(Owner);
   NewApp.Visible := true;
   ppdisp := NewApp.EmbeddedWB1.Application;
end;

Example of new window on MDI application:

procedure TChildFrm.EmbeddedWB1NewWindow2(ASender: TObject;
  var ppDisp: IDispatch; var Cancel: WordBool);
var
   NewApp: TChildFrm;
begin
   NewApp := TChildFrm.Create(Owner);
   NewApp.Visible := true;
   ppdisp := NewApp.EmbeddedWB1.Application;
end;


 Note:
In our package you can find demos for SDI, MDI, and tabbed browser that demonstrate all the above.