Total Operations Processing System is a computer system for managing railway locomotives and rolling stock, known for many years of use in the United Kingdom.
TOPS is a peer-to-peer LAN-based file sharing system best known in its Macintosh implementation, but also available for DOS and able to interoperate with Unix's NFS.
TOPS - Traffic Operator Position System is a computerized operator telephone switchboard designed by Bell-Northern Research Labs for the SP-1 4 Wire Switch in the early 1970s and still widely used today by toll and directory-assistance operators.
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