APPEND - (9)

 Moves the select range to the end of the PASTE buffer.  The select range is all
 the text between the selected position (see SELECT) and the current cursor
 position.  If no SELECT has been made and the cursor is positioned on the
 current search string, that string is appended.

 REPLACE - (GOLD 9)

 Deletes the select range and replaces it with the contents of the PASTE buffer.