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CALLBACK

 Replaces FAR PASCAL in application’s call back routine.

HANDLE

 32-bit unsigned integer that is used as a handle.

HDC

 Handle to a device context.

HWND

 32-bit unsigned integer that is used as the handle to a window.

LONG

 32-bit signed integer

LPARAM

 Type used for declaration of lParam.

LPCSTR

 LPCSTR is the same as LPSTR  but is used for read-only string pointers.

LPSTR

 32-bit pointer.

LPVOID

 A generic pointer type. It is equivalent to (void *).

LRESULT

 Used for the return value of a window procedure.

UINT

 An unsigned integer type

WCHAR

 A 16-bit UNICODE character. WCHAR is used to represent all of the symbols for all of the world’s languages.

WINAPI

 Replaces FAR PASCAL in API declarations.

WPARAM

 Used for the declaration of wParam.

HINSTANCE

 Handle to the current instance

MSG

 Defines the fields of an input message

PAINTSTRUCT

 Defines the paint structure used when drawing inside a window

RECT

 Defines a rectangle

WNDCLASS

 Defines a window class