SHRDLU was an early AI system developed by Terry Winograd which used restructed natural langauge processing to conctorl a simulated robot in a blocks world.
Defined on page 292
Used on Chap. 1: page 8; Chap. 13: pages 292, 293, 315; Chap. 15: page 345; Chap. 18: page 427
Links:
hci.stanford.edu: Stanford University: SHRDLU
Wikipedia: SHRDLU