TSRs (Terminate-and-Stay-Resident) are DOS programs that stay resident in memory after terminating. This allows another DOS application to be loaded, while the TSR can still be accessed by a software or hardware interrupt, such as a hot-key sequence. An example is the dial-up terminal emulator FTTERM.
A TSR will not work if it is added to the Workplace Shell using the steps in the previous section. The virtual DOS machine closes when it detects the TSR terminating and gives it no chance to become resident.
Figure "Setting Up a TSR Program"
To add a TSR to the Workplace Shell, do the following: