SPLIT_LINE
     Breaks the current line at the active editing point, creating two
     lines.
  Example
     The following procedure inserts two lines of text and a blank line:
     PROCEDURE user_memo_heading
        COPY_TEXT ("Interoffice Memo");   ! line 1
        SPLIT_LINE;
        COPY_TEXT ("Date: ");             ! line 2
        SPLIT_LINE;
        SPLIT_LINE;                       ! blank line after heading
     ENDPROCEDURE;
  Related topics
     COPY_TEXT   CURRENT_CHARACTER   CURRENT_LINE