(Terminate and Stay Resident) A program, usually loaded automatically on startup, which remains in memory to provide particular functions such as connection to a network or protection against viruses. In Windows 95/98 TSRs presently running are usually represented by icons in the System tray, such as the small loudspeaker which represents the volume control for the soundcard. A few TSRs are essential, but many are installed automatically by a particular application just to improve its own performance, with no thought for anything else you may be doing, and may actually have a negative impact on everything else. Usually (but not always) launched from the StartUp folder in the Windows Start Menu.
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