Columbia subject headings:
Interactive computer systems--Congresses.
Programming languages (Electronic computers)--Congresses.
Question-answering systems--Congresses.
System design--Congresses.
Harvard subject headings:
Command languages (Computer science)
Computer networks--Congresses
Human-machine systems--Congresses
Interactive computer systems--Congresses.
Princeton subject headings:
Computer networks--Congresses.
Interactive computer systems--Congresses.