Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     TSR
 
     Acronym for terminate and stay resident. A type of MS-DOS program
     that loads, hooks some interrupt vectors, then exits to MS-DOS
     using the terminate-and-stay-resident MS-DOS call. These programs
     remain in memory and execute in response to an interrupt.
 
     TSR programs are generally small utilities such as a pop-up notepad
     or extended device control (MSHERC.COM, for example).
 
     WARNING: Do not install TSR programs by running them from an
              operating-system shell. Doing so causes unpredictable
              results.
                                    -♦-