some emule mods offer a more advanced ipfilter updater that saves the user from downloading the full ipfilter file every time.
it work in downloading the ipfilter file from the url then analyzing it and giving that specific file a unique ID number (or tbh it might just check the time that the creation time of the file at the url), then every time it checks for an update if the IDs(or file times) are different from the current one it only then fully downloads it (because its obviously a more up-to-date one)
