This command shows a brief summary of the header information for the images contained in the buffers. If specific buffers are listed, the program lists information for only those buffers. Otherwise, all buffers with images in them are listed. If the keyword FULL is specified, a longer listing is given for each buffer. If the keyword FITS=param is given then the literal text of the FITS header is printed for the FITS header parameter 'param'. If you use just the keyword FITS (no specified parameter) AND you use the FULL keyword then all of the FITS header parameters will be shown.