The Analyzer provides four related commands which make moving
    from one hot spot to another easy. These commands take the
    current plot and use it to produce annotated source plots
    positioned at the most interesting lines. They are:

    NEXT       Go to the next interesting line
    BACK       Go to the previous interesting line
    FIRST      Go to the first interesting line
    CURRENT    Redisplay the current line

    Note that if there is no current plot (as when you first enter
    the Analyzer), then a default plot is be supplied, with the
    PROGRAM_ADDRESS BY ROUTINE nodespec.

    Also note that the command parameter SUBTREE may be useful
    when the current plot is a BY ROUTINE or BY MODULE plot. This
    parameter allows you to move between the routines or modules of
    these plots.