blink - Blink two frames
	     cv - Control image device, display "snapshot"
	    cvl - Load image display (newer version of 'display')
	  erase - Erase an image frame
	  frame - Select the frame to be displayed
	lumatch - Match the lookup tables of two frames
     monochrome - Select monochrome enhancement
    pseudocolor - Select pseudocolor enhancement
	    rgb - Select true color mode (red, green, and blue frames)
	 window - Adjust the contrast and dc offset of the current frame
	   zoom - Zoom in on the image (change magnification)