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Source: http://win32assembly.programminghorizon.com/tut2.html Windows prepares a wealth of resources for Windows programs. Central to this is the Windows API (Application Programming Interface). Windows API is a huge collection of very useful functions that reside in Windows itself, ready for use by any Windows programs. These functions are stored in several dynamic-linked libraries (DLLs) such as kernel32.dll, user32.dll and gdi32.dll. Kernel32.dll contains API functions that deal with memory and process management. User32.dll controls the user interface aspects of your program. Gdi32.dll is responsible for graphics operations. Other than "the main three", there are other DLLs that your program can use, provided you have enough information about the desired API functions. Windows programs dynamically link to these DLLs, ie. the codes of API functions are not included in the Windows program executable file. In order for your program to know where to find the desired API functions at runtime, you have to embed that information into the executable file. The information is in import libraries. You must link your programs with the correct import libraries or they will not be able to locate API functions. 
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