DECC$NO_ROOTED_SEARCH_LISTS

   When the decc$to_vms function evaluates a UNIX style path string,
   if it determines the first element to be a logical name, then:

   o  For rooted logicals or devices, it appends ":[000000]" to the
      logical name.

      For example, if log1 is a rooted logical ($DEFINE LOG1
      [DIR_NAME.]) then /log1/filename.ext translates to
      LOG1:[000000]FILENAME.EXT.

   o  For nonrooted logicals, it appends just a colon (:)  to the
      logical name.

      For example, if log2 is a nonrooted logical ($ DEFINE
      LOG2 [DIR_NAME]), then /log2/filename.ext translates to
      LOG2:FILENAME.EXT.

   o  If the first element is a search-list logical, the translation
      proceeds by evaluating the first element in the search list,
      and translating the path as previously described.

   The preceding three cases lead to predictable, expected results.

   In the case where the first element is a search list that
   consists of a mixture of rooted and nonrooted logicals,
   translating paths as described previously can lead to different
   behavior from that of older versions of OpenVMS (before OpenVMS
   Version 7.3-1):

   o  Before OpenVMS Version 7.3-1, regardless of the contents of
      the logical, the decc$to_vms function appended only a colon
      (:).  For search lists that consisted of a mixture of rooted
      and nonrooted logicals, this resulted in certain expected
      behaviors.

   o  For OpenVMS Version 7.3-1 and later, if the first element
      of the mixed search list is a rooted logical, then decc$to_
      vms appends ":[000000]" to the logical name, resulting in
      different behavior from that of OpenVMS releases prior to
      Version 7.3-1.

   DECC$NO_ROOTED_SEARCH_LISTS controls how the decc$to_vms function
   resolves search-list logicals and provides a means to restore the
   OpenVMS behavior prior to Version 7.3-1.

   With DECC$NO_ROOTED_SEARCH_LISTS enabled:

   o  If a logical is detected in a file specification, and it is
      a search list, then a colon (:)  is appended when forming the
      OpenVMS file specification.

   o  If it is not a search list, the behavior is the same as with
      DECC$NO_ROOTED_SEARCH_LISTS disabled.

   Enabling this feature logical provides the pre-Version 7.3-1
   behavior for search list logicals.

   With DECC$NO_ROOTED_SEARCH_LISTS disabled:

   o  If a logical is detected in a file specification, and it is
      a rooted logical (or a search list whose first element is a
      rooted logical), then ":[000000]" is appended when forming the
      OpenVMS file specification.

   o  If it is a nonrooted logical (or a search list whose first
      element is a nonrooted logical), then just a colon (:)  is
      appended.

   Disabling this feature logical provides the behavior for OpenVMS
   Version 7.3-1 and later.