office-developer-client-docs/xlfcaller.md at master
https://github.com/MicrosoftDocs/office-developer-client-docs/blob/master/docs/excel/xlfcaller.md
Returns information about the cell, range of cells, command on a menu, tool on a toolbar, or object that called the DLL command or function that is currently running. Excel12 ( xlfCaller, ( LPXLOPER12) pxRes, 0 ); Property value/Return value
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