Library /sys$common/syshlp/basichelp.hlb WHEN_ERROR, Syntax  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  With an Attached handler:

      WHEN ERROR IN
          protected-statement
          [protected-statement,...]
         .
         .
         .
      USE
          handler-statement
          [handler-statement,...]
         .
         .
         .
      END WHEN

  With a Detached Handler:

      WHEN ERROR USE handler-name
           protected-statement
           [protected-statement,...]
          .
          .
          .
      END WHEN
      HANDLER handler-name
           handler-statement
           [handler-statement,...]
          .
          .
           .
      END HANDLER