What is TSR?

 What is TSR? Terminate Stay Resident Pop-Up Programs Special
TSR - Terminate and Stay Resident

     Describes programs that the user can load into the computer and then forget about until they're needed, even while working with other programs. Pressing a special key combination will cause the TSR program to 'pop up', or activate, so that it can be used; it may then also be possible to paste data generated by the TSR into the application in use. For example, a pop-up address book might supply the details to be added to a letter being produced in a word processor. Now that multitasking (e.g. under Windows) is becoming commonplace, it's possible to flip between ordinary applications and the need for TSRs is disappearing.

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 What is TSR? Terminate Stay Resident Pop-Up Programs Special