By the time the
servlet or
JSP generated code gets to the browser, it is just HTML (or nowadays, maybe XML). A browser scripting language is JavaScript and with it you can pop up a separate window with the toolbars that you need.
I don't see why you cannot generate Javascript code in the servlet that would open sucha a window.
waitMainWindow=window.open("","mainwait","status=no,toolbar=no,location=no,
menu=no,width=500,height=200,left=30,top=30,screenX=30,screenY=30");
var text = "";
text += "<HTML><HEAD><TITLE>PAGE TITLE</TITLE><BODY BGCOLOR=#000000>";
text += "PAGE BADOY HERE"
text += "</BODY></HEAD></HTML>";
waitMainWindow.document.write(text);
waitMainWindow.document.close();