Visually Signal Experimenter
Using this keyword makes DMDX repeatedly flash the title bar of the main DMDX dialog at the end of the item. N specifies frequency (in milliseconds) of the bell sounding again, the default being 2500ms. This can be used in conjunction with <AcousticallySignalExperimenter>, if both are used the frequency of the last one specified is used. This is not much use in a single monitor system as the subject's display is occluding the main DMDX dialog, if however Remote Monitoring is used or the system is a mulitmon system this flashing is visible.