The KS command modifies the cursor position after a PASTE command.

 After a PASTE command, the cursor is on the character to the right of
 the pasted text.  If PASTE is followed by KS, however, the cursor moves
 to the last pasted character if the current direction is forward and to
 the first pasted character if the direction is backward.  You should
 only use the KS command immediately after a PASTE command.

 Format: PASTE KS

 Such cursor positioning affects a subsequent string search.  KS is used
 in the definition of the keypad SUBS function so that the character that
 follows the pasted text in the current direction is included in the next
 string search.