<communications> (DTMF, or "touch-tone") A method used by the telephone system to communicate the keys pressed when dialling. Pressing a key on the phone's keypad generates two simultaneous tones, one for the row and one for the column. These are decoded by the exchange to determine which key was pressed. (1995-03-28)

Dual-tone multi-frequency signaling (DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers. DTMF was first developed in the Bell System in the United States, and became known under the trademark Touch-Tone for use in push-button telephones supplied to telephone customers, starting in 1963.

DeskTop Management task Force (Reference: Intel)

Dual Tone Multi Frequency

Dual Tone Multi Frequency

Tone Dialing is an album recorded in 1995 by the American jazz composer and saxophonist Ornette Coleman and his Prime Time ensemble. It was released in September 1995 by Coleman's Harmolodic record label, in partnership with Verve/PolyGram.

<operating system> Any system offering the user the choice of two operation systems (OSes) under which to start a computer. A dual boot system allows the user to run programs for both operating systems on a single computer (though not simultaneously). The term "multiple boot" or "multiboot" extends the idea to more than two OSes. The OSes are generally unaware of each other's existence. They are installed on separate hard disk partitions or on separate disks. They may be able to access each other's files, possibly via some extra driver software if they use different file systems. The OSes need not be completely different - they might be different versions of Microsoft Windows (e.g. Windows XP and Windows NT) or Linux (e.g. Debian and Fedora). A dual boot system differs from an emulator such as vmware, which runs one or more OSes "on top" of the primary OS, using its resources. (2005-02-01)

Tone policing (also tone trolling, tone argument, and tone fallacy) is an ad hominem (personal attack) and anti-debate tactic based on criticizing a person for expressing emotion. Tone policing detracts from the truth or falsity of a statement by attacking the tone in which it was presented rather than the message itself.