Fremde Anwendung als MDI-Fenster starten

[Shivan]

so in die Richtung:
SetWindowLong(l_Form.Handle, GWL_STYLE, GetWindowLong(l_Form.Handle, GWL_STYLE) and WS_CHILD and not WS_BORDER and not WS_DLGFRAME and not WS_SYSMENU and not WS_THICKFRAME and not WS_GROUP);