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

t(erminate and) s(tay) r(esident)

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Computing Dictionary

TSR definition

Terminate and Stay Resident

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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American Heritage
Abbreviations & Acronyms
terminate and stay resident
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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