X terminals, 12. See also terminals X Window system. See also window managers advantages, 43 client-server architecture, 43–44, 48–50 development, 42 fun programs, 44 Internet resources, 358 for Mac OS X, 42 manual pages, 355 opening a new window, 51, 52 policy independence, 43, 45 running multiple programs, 200 stopping, 329–330 troubleshooting, 308, 329–330 window managers, 45–47 X server for, 48 XEmacs. See emacs text editor xeyes program, 44 xman command, 355 xmille program, 44 xpcterm program, 51 xphoon program, 44 xroach program, 44 xsnow program, 44 xsol program, 44 Xt X Windows toolkit, 49 xterm program, 51, 74–76, 200