URC urchin URI URL URL forwarding URL redirection URN URouLette US us US Robotics US-ASCII usa.net usability USAModSim
| USB USB 2.0 USB Adapter Card Support USE Use the Source Luke Usenet Usenet news Usenetter USENIX user user acceptance testing user base User Brain Damage User Datagram Protocol user id
| user identifier user interface user interface copyright User Interface Language user name User Network Interface user-friendly user-obsequious user-unctuous USG Unix usim USL USP USR usr
|