Specifies whether you want to display the optional applet user interface.
<PARAM NAME = "allow_ui" VALUE = "setting">
Unless the allow_ui PARAM tag is supplied, the default behavior is for the applet to have no visible user interface. Because applets must have their width and height specified by the APPLET tag, setting this parameter is not enough to create an "invisible" applet. If this parameter is supplied, the application developer can specify (0, 0) dimensions to completely "hide" the applet.