NEW_DATA

        [LAS\]NEW_DATA [Interval]

    Waits until new observations have been written to the  input  file,  and
    then  return.  No modification of the input or current index is done. It
    is then expected to use FIND NEW_DATA|UPDATE to rebuild the indexes with
    these new observations (see corresponding HELP for details).

    The waiting time between 2 check can be customized as first argument (in
    seconds, default 5).