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About Writing a User Exit in Microsoft Windows

On Microsoft Windows, a foreign function that can be invoked from a user exit is contained in a dynamic link library(DLL). A DLL is a library that loads into memory only when the contained code is invoked, and a DLL can be shared by multiple applications. Before proceeding, you should be familiar with the procedure for building DLLs, as described in your compiler manual.

Note: Some C runtime functions are not available in .DLL files. For more information, refer to your compiler documentation.


Compiling Microsoft Windows foreign functions

Microsoft Windows user exit interface files

Writing a user exit on Microsoft Windows