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TSR

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noun, plural TSRs, TSR's.
  1. a computer program with any of several ancillary functions, usually held resident in RAM for instant activation while one is using another program.
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Origin of TSR

t(erminate and) s(tay) r(esident)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018