The EDIT command invokes an editor to edit the source file
    displayed by the current PLOT or TABULATE command. To edit the
    default module, use a traverse command (see the Traverse_Commands
    topic in HELP) or the /SOURCE qualifier on the PLOT or TABULATE
    command and use a BY LINE or BY CODEPATH node specification.

    If you specify no parameter on the EDIT command, the editor
    is positioned at the central line of the PLOT or TABULATE page
    currently shown on your terminal. The module-name and line-number
    parameters allow you to position the editor at a different source
    file or line.

    When you exit from the editor, you are then returned to the
    Analyzer session. However, if you use the /EXIT qualifier on the
    EDIT command, the Analyzer session is terminated and the editor
    is invoked in the same process.

    The editor you call must be accessible from DCL level, and may be
    set with the SET EDITOR command.