{
{    This procedure is called during deadstart when the image file is
{attached and opened.  It initializes the fields in mmv$image_file.
{
{Parameters:
{  SFID: (dmt$system_file_id) This is the system file id of the image file.
{
{  LENGTH: This is the length of the information immediately
{          preceding the actual memory image on the image
{          file segment.
{
