UDP                Umman              UpdateMethodsTbl   Ustat  
URLCache           Umsg               Uprocess           Usyslog  
Udir               UnFmt              Upwd               Utils  
Uerror             Unetdb             Uresource          Utime  
Uexec              UnitImpl           Usem               Utypes  
Uglob              Unix               UserProc           Uugid  
Ugrp               UnsafeRd           Ushm               Uuio  
Uin                UnsafeWr           Usignal            Uutmp  
Uipc               Upaths             Usocket            Uutsname