Library /sys$common/syshlp/dbg$help.hlb DEBUG, STEP, Qualifiers, /LINE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Executes the program to the next line of source code. However,
    the debugger skips over any source lines that do not result
    in executable code when compiled (for example, comment lines).
    STEP/LINE has the same effect as SET BREAK/TEMPORARY/LINE;GO.
    This is the default behavior for all languages.