1.CDO>  DEFINE CONTEXT BUILD_SYSTEM_CONTEXT
      cont>   BASE_PARTITION IS FIRST_BASELEVEL  TOP IS COMPILER_C
      cont>   DEFAULT_ATTACHMENT IS LATEST_CHECKIN.
         .
         .
         .
      CDO>  UPDATE COLLECTION COMPILER_C

      In this example, the UPDATE command refers to the DEFAULT_
      ATTACHMENT keyword (LATEST_CHECKIN) for the version to attach.
      UPDATE then detaches the currently attached version of the
      COMPILER_C collection and attaches the version most recently
      replaced.

    2.CDO>  DEFINE CONTEXT WRITE_CONTEXT
      cont>   BASE_PARTITION IS FIRST_DRAFT TOP IS REFERENCE_MANUAL
      cont>   DEFAULT_ATTACHMENT IS SPECIFIC_VERSION.
         .
         .
         .
      CDO>  CHANGE CONTEXT WRITER_CONTEXT
      cont>   DESCRIPTION IS "CHANGING DEFAULT_ATTACHMENT"
      cont>   "TO PICK UP AL'S CHAPTERS"
      cont>   DEFAULT_ATTACHMENT IS LATEST.
      CDO>  UPDATE COLLECTION REFERENCE_MANUAL

      In this example, the UPDATE command refers to the DEFAULT_
      ATTACHMENT keyword (LATEST) for the version to attach. UPDATE
      then detaches the currently attached version of the REFERENCE_
      MANUAL collection and attaches the latest version, whether
      checked in or ghost.