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

    (Applies to STDL programs only. Requires the installation of the
    Correlation Facility (a separate layered product) and invocation
    of the kept debugger.) Cancels the effect of a previous SET
    SOURCE/ORIGINAL command. The SET SOURCE/ORIGINAL command is
    required to debug STDL source files, and must be canceled when
    you debug source files written in other languages.