CURRENT_COLUMN
     Returns an integer identifying the current column of the cursor on the
     screen.  This does not reflect any movement of the current position
     that has occurred within a procedure in which CURRENT_COLUMN is used
     unless the built-in UPDATE (window) precedes it.
  Syntax
     integer := CURRENT_COLUMN
  Examples
     1.  my_cur_col := CURRENT_COLUMN;
         Stores in the variable MY_CUR_COL the integer for the column
         position of the cursor on the screen.
     2.  MESSAGE (STR (CURRENT_COLUMN));
         Combines three DECTPU built-ins:  CURRENT_COLUMN returns the
         integer for the current column position; STR converts the integer
         to a string; and MESSAGE writes this string to the message buffer.
  Related topics
     CURRENT_OFFSET   CURRENT_ROW   UPDATE