Transcription: You can use Dynamic Link Libraries, or DLLs, to access functions outside of Toolbook. Before you can use a DLL, you must link to it, which we'll do in the book script. We'll add an Enter Book Handler so that our DLL is linked as the book is started. The function we want to access is in the file User. Here, we declare the function LockWindowUpdate. We'll also write a Leave Book Handler. Here, we'll unlink the file Finally, we update the script and exit. Now we've linked to a DLL and declared a function. In the next task, we'll call the DLL function to create an object transition.
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