/sys$common/syshlp/helplib.hlb LSEDIT, Command Qualifiers, /ENVIRONMENT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  /ENVIRONMENT=file-spec-list
  /NOENVIRONMENT (D)

  Specifies the name of one or more binary environment  files  containing
  LSE  language,  token,  placeholder,  or  alias definitions.  LSE reads
  these definitions as part of LSE startup.  If you specify more than one
  file,  you must enclose the files in parentheses and separate them with
  commas.

  If definitions or deletions of items appear in more than one file,  the
  definition that appeared in the first listed file takes precedence.

  SYS$LIBRARY is the default device, and the default file type is .ENV.

  The logical name LSE$ENVIRONMENT is an alternative to the  /ENVIRONMENT
  qualifier.   If  /ENVIRONMENT  or  /NOENVIRONMENT is not used, LSE will
  attempt to translate the logical name LSE$ENVIRONMENT.  If the  logical
  name  has  translations,  the  values  are  used in the same way as the
  /ENVIRONMENT qualifier values.  LSE translates the first ten indices of
  the  logical name LSE$ENVIRONMENT.  (Refer also to the SAVE ENVIRONMENT
  command description in the Language-Sensitive Editor User's Guide.)