The XFree86 package contains the X Window System for Linux (and other operating systems). It includes the X server, fonts, xterm, a simple window manager (twm), various utilities, video output drivers, and various input drivers including the mouse and keyboard. XFree86 also contains libraries and header files for development of the X Window System programs. The following list of programs is not comprehensive. The full list is in /usr/X11R6/bin. For additional information about these programs, see the respective man page. XFree86 is the X11R6 implementation of the X Window System server. xf86config is an interactive program for generating an XF86Config file for use with XFree86 X servers. xf86cfg is a tool to configure XFree86 that can be used to either write the initial configuration file or make customizations to the current configuration. startx is a script to initialize the X session. It runs xinit. xinit is used to start the X Window System server. twm is a Tab Window Manager for the X Window System. xterm is a terminal emulator for X. xwininfo is a window information utility for X. x11perf is an X11 server performance test program. xlsfonts is a program to list fonts available to the X server. xvidtune is a video mode tuner for XFree86. xload is a system load average display for X. xcalc is a scientific calculator for X. Clock programs for X. xmodmap is a utility for modifying keymaps and pointer button mappings in X.