Definitions for "Terminate-and-Stay-Resident Program"
TSR. A DOS program that stays loaded in memory, even when it is not actually running , so that you can invoke it very quickly to perform a specific task. Calendars, appointment schedulers, calculators are all popular TSR programs. TSRs occupy conventinal memory space that becomes unavailable for use by your applications programs
A program that runs in the background, allowing other programs to be run at the same time.
A program that loads itself into random access memory (RAM) and remains there so that it can be instantly activated. The TSR is removed from memory when the computer is turned off.