The simplest way to import a procedure or function is to declare it using the external directive. For example, procedure DoSomething; external 'MYLIB.DLL';
If you include this declaration in a program, MYLIB.DLL is loaded once, when the program starts. Throughout execution of the program, the identifier DoSomething always refers to the same entry point in the same shared library.
Declarations of imported routines can be placed directly in the program or unit where they are called. To simplify maintenance, however, you can collect external declarations into a separate "import unit" that also contains any constants and types required for interfacing with the library. Other modules that use the import unit can call any routines declared in it.
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