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

  Syntax:  SET DIRECTORY SOURCE directory_spec

  Specifies a directory to be used to find source files.

  This command specifies the directories LSE uses to find source files
  when you issue commands that read files.  You can specify one or more
  directory specifications.  To remove a list of directories, enter
  this command with a blank directory specification.

  RELATED COMMANDS:

     GOTO SOURCE                 OPEN FILE
     INCLUDE FILE                SHOW ATTRIBUTES
     OPEN FILE