Subclassing is a way to intercept the Windows messages when the usb entry. With subclassing, we can change the information in our arbitrarily, in other words, if we can intercept the messages , we can replace it with a message / other messages in accordance with our wishes .. Subclassing (here) allows us to send an event that occurred or Message, we create a form that would identify or tell us that device has been detect (plugged in)
