CURRENT_CHARACTER
     Returns a string one-character long for the current character in the
     current buffer.
  Syntax
     string := CURRENT_CHARACTER
  Examples
     1.  my_cur_char := CURRENT_CHARACTER;
         Stores in the variable MY_CUR_CHAR the string representing the
         current character.
     2.  SHOW (CURRENT_CHARACTER);
         Returns the string representing the current character and uses this
         string as the parameter for the SHOW built-in.  (See help on SHOW.)