There is an example packaged with TeleFlow.
In TeleFlow Designer, go to: File >> New Application... >> Example Task >> DLL Function >> Ok.
The "DLL Function" step in the "DLLFunction" flowchart shows you how to use a custom DLL in a TeleFlow application.
The DLL it uses - GetEnv.dll - is packaged with TeleFlow, and its contents and the rules for how to construct a custom DLL for use with TeleFlow are in the help topic for the "DLL Function" step. (In the TeleFlow help file, go to: 1 - Develop Applications with TeleFlow Designer >> Steps Toolbox >> TeleFlow Steps >> Programming Steps (Prog. tab) >> DLL Function)
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