TDOSMEM: Passes Data between a Microsoft(R) Windows(TM) Application and an MS-DOS(R) TSR

TDOSMEM communicates with the TTSR program to demonstrate a technique for passing data between a Microsoft(R) Windows(TM) application and an MS-DOS(R) terminate-and-stay-resident (TSR) program.

TDOSMEM calls the kernel functions AllocSelector, SetSelectorBase, and SetSelectorLimit and uses these functions to update a buffer in a global TSR program. Running multiple copies of TDOSMEM demonstrates how different instances of a Windows program can access a TSR program's private buffer directly.

Before you start Windows, run TTSR.EXE from the MS-DOS prompt to install the TSR program that TDOSMEM will call. After you start Windows, run the TDOSMEM program. The TDOSMEM main window displays the buffer address and buffer contents of the TSR program. Clicking on the Request menu causes TDOSMEM to increment a WORD value in the TSR program's private buffer and updates the results in the TDOSMEM main window.

TDOSMEM was built and tested under Microsoft Windows version 3.1.

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