1) Automats lack them 2) Café society 3) Central computers 4) Contents of some data centers 5) Data-sharing computers 6) Order takers 7) Restaurant staff 8) Server 9) Tennis players, often 10) They wait for money 11) Waiters 12) Waiters and waitresses 13) Waitstaff 1) Trays 2) Waiters 
Computers used in networks to store files etc, for use by other PCs on the network. :: Dell (8th Edition)
Computers that exist only to provide things to others.