#3 ESSENTIAL CONCEPTS #4 ESSENTIAL CONCEPTS #3 #4 #3* Double escape is command terminator #4* Double escape is command terminator #3* Files and text buffer #4* Files and text buffer #3* The text pointer #4* The text pointer #3* Arguments to TECO commands #4* Arguments to TECO commands #3* Q-registers #4* Q-registers #3 #4