ItweakU is a utility that allows you to speed up your Internet connection by changing your default RWIN, default TTL, maximum MTU, and maximum MSS values. It also has security features that prevent users from adding or removing printers, shutting down the system, and so on. Features include the ability to disable Regedit and added compatibility with Windows NT. Version 4.18 now features over 410 different 'tweak' options.