[DllImport("user32.dll")] public static extern bool GetKeyboardState([Out] byte[] lpKeyState);
[DllImport("kernel32.dll", EntryPoint = "CopyMemory", SetLastError = false)] public static extern void CopyMemory([Out] IntPtr dest, [In] IntPtr src, uint count);In this example, the CopyMemory function from the kernel32.dll library is called. The [Out] attribute is used to indicate that the dest parameter is an output parameter. This parameter is a pointer to the memory location where the memory block will be copied to. The src parameter is an input parameter that is a pointer to the memory location of the memory block to be copied. In summary, POut is a package library in C# that provides a mechanism for marshalling data between managed and unmanaged code. It is used to specify the memory location of an output parameter in a native method. It is commonly used with the [Out] attribute to indicate that a parameter is an output parameter.