meaning of ddn
1. DDN Defense Data Network DDO Dynamic Drive Overlay DDP Distributed Data Processing DDR-RAM Double Data Rate Random Access Memory DDR-SDRAM Double Data Rate Random Access Memory DDS 1. Digital Data Service. 2. Digital Data System. 3. Dataphone Digital Service. DDT 1. Generic term for a program that assists in debugging other programs by showing individual machine instructions in a readable symbolic form and letting the user change them. In this sense the term DDT is now archaic, having been widely displaced by "debugger" or names of individual programs like "adb", "sdb", "dbx", or "gdb". 2. Under MITs fabled ITS operating system, DDT running under the alias HACTRN was also used as the shell or top level command language used to execute other programs. 3. Any one of several specific debuggers supported on early DEC hardware. The DEC PDP-10 Reference Handbook 1969 contained a footnote on the first page of the documentation for DDT that illuminates the origin of the term: Historical footnote: DDT was developed at MIT for the PDP-1 computer in 1961. At that time DDT stood for "DEC Debugging Tape". Since then, the idea of an on-line debugging program has propagated throughout the computer industry. DDT programs are now available for all DEC computers. Since media other than tape are now frequently used, the more descriptive name "Dynamic Debugging Technique" has been adopted, retaining the DDT abbreviation. Confusion between DDT-10 and another well known pesticide, dichloro-diphenyl-trichloroethane
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