$($a$)$ The Library of Congress print$-$manuscript database system.

$($b$)$ A police database that provides information on stolen automobiles.

$($c$)$ An automatic teller machine in a shopping mall.

$($d$)$ A coin$-$operated video game in some amusement park.

$($e$)$ A university grade$-$processing system.

$($f$)$ A computer$-$controlled routing switch used at a telephone company branch exchange.