Library /sys$common/syshlp/lse$menu.hlb SAVE_ENVIRONMENT_CHANGES  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Syntax:  SAVE ENVIRONMENT CHANGES file_spec

  Saves language definitions (including placeholders, tokens, aliases,
  and packages) that were defined in the current editing session in an
  environment file.

  Definitions that were read in from an environment file are not
  written.