[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] 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