A TSR can be as simple as that (or even simpler -- a TSR doesn't have to do
anything useful at all), but can also be much more than that. Pretty much
anything a "regular" (foreground) program does can also be done with a TSR, but
a TSR does it in the background while you are doing other things in the
foreground. > Actually,it is.The program returns control to the operating
system (DOS),but it stays> resident in computer memory (be it low,medium or
high).It can then be reactivated by a
> hardware or software interrupt vector.For example,device
> drivers."CTMOUSE.EXE" is> an example of a TSR program.It is a driver that
> stays in an interrupt vector in the> computers memory.
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