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X clients 
X service 
X Window System 
    attacks on 
    compared to LDAP 
    security and 
    terminals, protecting local storage in 
    tunneling with 
X/Open Consortium 
X0hosts file 
xargs command  2nd 
Xauthority facility, magic cookies 
.Xauthority file 
xclock 
xdm system 
XDR (external data representation)  2nd 
XENIX operating system 
Xerox Networks System (XNS) 
xferlog file 
xhost command 
xinetd 
Xinu operating system 
XNS (Xerox Networks System) 
xterm