If unsuccessful, the plug-in is not loaded and the function returns an error code. For possible values, see Error Codes.
The browser calls this function only once: when a plug-in is loaded, before the first instance is created. This is the first function that the browser calls. NP_Initialize tells the plug-in that the browser has loaded it and provides global initialization. Allocate any memory or resources shared by all instances of your plug-in at this time.
After the last instance of a plug-in has been deleted, the browser calls NP_Shutdown, where you can release allocated memory or resources.