Provided by: xscreensaver_4.23-4ubuntu8_i386 bug

NAME

       xscreensaver-demo  -  interactively control the background xscreensaver
       daemon

SYNOPSIS

       xscreensaver-demo [-display host:display.screen] [-prefs] [--debug]

DESCRIPTION

       The xscreensaver-demo program is a graphical front-end for setting  the
       parameters  used  by  the  background  xscreensaver(1)  daemon.   It is
       essentially two things: a tool for editing  the  ~/.xscreensaver  file;
       and a tool for demoing the various graphics hacks that the xscreensaver
       daemon will launch.

       The main window consists of a menu bar and two tabbed pages.  The first
       page  is  for  editing the list of demos, and the second is for editing
       various other parameters of the screensaver.

MENU COMMANDS

       All of these commands are on either the File or Help menus:

       Blank Screen Now
           Activates the background xscreensaver daemon, which will then run a
           demo  at  random.   This  is  the  same  as  running  xscreensaver-
           command(1) with the -activate option.

       Lock Screen Now
           Just like Blank Screen Now, except the screen  will  be  locked  as
           well  (even if it is not configured to lock all the time.)  This is
           the same as running xscreensaver-command(1) with the -lock  option.

       Kill Daemon
           If  the  xscreensaver  daemon  is  running on this screen, kill it.
           This is the same as running xscreensaver-command(1) with the  -exit
           option.

       Restart Daemon
           If  the  xscreensaver  daemon  is  running on this screen, kill it.
           Then launch it again.  This is the same  as  doing  ‘‘xscreensaver-
           command -exit’’ followed by ‘‘xscreensaver’’.

           Note  that  it  is  not  the  same  as doing ‘‘xscreensaver-command
           -restart’’.

       Exit
           Exits  the  xscreensaver-demo  program   (this   program)   without
           affecting the background xscreensaver daemon, if any.

       About...
           Displays the version number of this program, xscreensaver-demo.

       Documentation...
           Opens  up a web browser looking at the XScreenSaver web page, where
           you   can   find   online   copies    of    the    xscreensaver(1),
           xscreensaver-demo(1), and xscreensaver-command(1) manuals.

DISPLAY MODES TAB

       This  page contains a list of the names of the various display modes, a
       preview area, and some fields  that  let  you  configure  screen  saver
       behavior.

       Mode
           This  option  menu  controls the behavior of the screen saver.  The
           options are:

               Disable Screen Saver
                       Don’t ever blank the screen, and don’t ever  allow  the
                       monitor to power down.

               Blank Screen Only
                       When  blanking the screen, just go black: don’t run any
                       graphics hacks.

               Only One Screen Saver
                       When blanking the screen, only ever use one  particular
                       display mode (the one selected in the list.)

               Random Screen Saver
                       When  blanking the screen, select a random display mode
                       from among those that are enabled and applicable.  This
                       is the default.

               Random Same Saver
                       This option only appears if you have multiple monitors.
                       This is just like Random Screen Saver, except that  the
                       same  randomly-chosen  display  mode will be run on all
                       monitors, instead of a different one being run on each.

       Demo List
           Double-clicking  in  the  list on the left will let you try out the
           indicated demo.  The screen will go black, and the program will run
           in  full-screen  mode,  just as it would if the xscreensaver daemon
           had launched it.  Clicking the mouse again will stop the  demo  and
           un-blank the screen, making the dialog box visible again.

           Single-clicking  in  the list will run it in the small preview pane
           on the right.  (But  beware:  many  of  the  display  modes  behave
           somewhat  differently  when  running  in  full-screen  mode, so the
           scaled-down view might not give an accurate impression.)

           When Mode is set to Random Screen Saver, each name in the list  has
           a  checkbox  next to it: this controls whether this display mode is
           enabled.  If it is unchecked, then that mode will  not  be  chosen.
           (Though  you  can still run it explicitly by double-clicking on its
           name.)

       Arrow Buttons
           Beneath the list are a pair of up and down arrows. Clicking on  the
           down  arrow  will select the next item in the list, and then run it
           in full-screen mode, just as if you had double-clicked on it.   The
           up  arrow  goes  the other way.  This is just a shortcut for trying
           out all of the display modes in turn.

       Blank After
           After the user has been idle this  long,  the  xscreensaver  daemon
           will blank the screen.

       Cycle After
           After the screensaver has been running for this long, the currently
           running graphics demo will be killed, and a new  one  started.   If
           this  is  0, then the graphics demo will never be changed: only one
           demo  will  run  until  the  screensaver  is  deactivated  by  user
           activity.

       Lock Screen
           When  this is checked, the screen will be locked when it activates.

       Lock Screen After
           This controls the length of the ‘‘grace period’’ between  when  the
           screensaver  activates,  and  when  the screen becomes locked.  For
           example, if this is 5 minutes, and Blank After is 10 minutes,  then
           after  10  minutes,  the  screen  would  blank.   If there was user
           activity at 12 minutes, no password would be required  to  un-blank
           the screen.  But, if there was user activity at 15 minutes or later
           (that is, Lock  Screen  After  minutes  after  activation)  then  a
           password  would  be  required.   The  default is 0, meaning that if
           locking is enabled, then a password will be required as soon as the
           screen blanks.

       Preview
           This button, below the small preview window, runs the demo in full-
           screen mode so that you can try it out.  This  is  the  same  thing
           that  happens  when you double-click an element in the list.  Click
           the mouse to dismiss the full-screen preview.

       Settings
           This button will pop up a dialog where you can  configure  settings
           specific to the display mode selected in the list.

ADVANCED TAB

       This  tab  lets  you  change  various settings used by the xscreensaver
       daemon itself, rather than its sub-programs.

       Grab Desktop Images
           Some of the graphics hacks manipulate images.  If  this  option  is
           selected,  then  they  are allowed to manipulate the desktop image,
           that is, a display mode  might  draw  a  picture  of  your  desktop
           melting,  or  being  distorted  in some way.  The security-paranoid
           might want to disable this option, because if it is set,  it  means
           that the windows on your desktop will occasionally be visible while
           your screen is locked.  Others will not be able to do anything, but
           they may be able to see whatever you left on your screen.

       Grab Video Frames
           If your system has a video capture card, selecting this option will
           allow the image-manipulating modes to capture a frame of  video  to
           operate on.

       Choose Random Image
           If  this  option  is  set,  then  the image-manipulating modes will
           select a random image  file  from  disk,  from  the  directory  you
           specify   in   the  text  entry  field.   That  directory  will  be
           recursively searched for files, and it  is  assumed  that  all  the
           files under that directory are images.

           If  more  than  one of these options are selected, then one will be
           chosen at random.  If none of them are selected, then an  image  of
           video colorbars will be used instead.

           (All    three    of    these   options   work   by   invoking   the
           xscreensaver-getimage(1) program, which is what actually  does  the
           work.)

       Text Manipulation
           Some  of  the  display  modes  display  and  manipulate  text.  The
           following options control  how  that  text  is  generated.   (These
           parameters   control   the  behavior  of  the  xscreensaver-text(1)
           program, which is what actually does the work.)

       Host Name and Time
           If this checkbox is selected, then the  text  used  by  the  screen
           savers will be the local host name, date, time, and system load.

       Text
           If  this  checkbox  is selected, then the literal text typed in the
           field to  its  right  will  be  used.   If  it  contains  %  escape
           sequences, they will be expanded as per strftime(2).

       Text File
           If   this   checkbox   is   selected,  then  the  contents  of  the
           corresponding file will be displayed.

       Program
           If this checkbox is selected, then the given program will  be  run,
           and its output will be displayed.

       URL If  this  checkbox  is  selected,  then  the given HTTP URL will be
           downloaded and displayed  repeatedly.   If  the  document  contains
           HTML, RSS, or Atom, it will be converted to plain-text first.

           Note:  this  re-downloads  the document every time the screen saver
           runs out of text!  It might be considered abusive for you to  point
           this  at  a web server that you do not control, as it will probably
           be hitting that server multiple times a minute.

       Power Management Enabled
           Whether the monitor should  be  powered  down  after  a  period  of
           inactivity.

           If  this  option  is  grayed  out,  it means your X server does not
           support the XDPMS extension, and  so  control  over  the  monitor’s
           power state is not available.

           If you’re using a laptop, don’t be surprised if this has no effect:
           many laptops have monitor power-saving behavior built in at a  very
           low  level  that  is invisible to Unix and X.  On such systems, you
           can typically only  adjust  the  power-saving  delays  by  changing
           settings in the BIOS in some hardware-specific way.

       Standby After
           If  Power Management Enabled is selected, the monitor will go black
           after this much idle time.   (Graphics  demos  will  stop  running,
           also.)

       Suspend After
           If  Power  Management Enabled is selected, the monitor will go into
           power-saving mode after this much idle time.  This duration  should
           be greater than or equal to Standby.

       Off After
           If  Power  Management  Enabled  is selected, the monitor will fully
           power down after this much idle  time.   This  duration  should  be
           greater than or equal to Suspend.

       Fade To Black When Blanking
           If  selected,  then  when  the  screensaver  activates, the current
           contents of the screen will fade to black instead of simply winking
           out.   (Note:  this  doesn’t work with all X servers.)  A fade will
           also be done when switching graphics hacks (when  the  Cycle  After
           expires.)

       Unfade From Black When Unblanking
           The  complement  to  Fade  Colormap:  if  selected,  then  when the
           screensaver deactivates, the original contents of the  screen  will
           fade  in from black instead of appearing immediately.  This is only
           done if Fade Colormap is also selected.

       Fade Duration
           When fading or unfading are selected, this controls  how  long  the
           fade will take.

       Install Colormap
           On  8-bit  screens, whether to install a private colormap while the
           screensaver is active, so that the graphics hacks can get  as  many
           colors as possible.  This does nothing if you are running in 16-bit
           or better.

       There are more settings than these available, but these  are  the  most
       commonly  used  ones;  see  the  manual  for  xscreensaver(1) for other
       parameters that can be set by editing the ~/.xscreensaver file, or  the
       X resource database.

SETTINGS DIALOG

       When  you  click  on  the  Settings  button on the Display Modes tab, a
       configuration dialog will pop up that lets you  customize  settings  of
       the  selected  display  mode.   Each  display  mode  has its own custom
       configuration controls on the left side.

       On the right side is a paragraph or two describing  the  display  mode.
       Below  that  is  a  Documentation  button that will display the display
       mode’s manual page, if it has one, in a new window (since each  of  the
       display  modes is actually a separate program, they each may have their
       own manual.)

       The Advanced button reconfigures the dialog box so that  you  can  edit
       the  display  mode’s  command  line  directly,  instead  of  using  the
       graphical controls.  It also lets you configure the X visual type  that
       this  mode  will require.  If you specify one (other than Any) then the
       program will only be run on that kind of visual.  For example, you  can
       specify  that  a  particular  program  should  only  be run if color is
       available, and another should only  be  run  in  monochrome.   See  the
       discussion  of  the  programs parameter in the Configuration section of
       the xscreensaver(1) manual.  (OpenGL programs should always have  their
       visual set to "GL".)

COMMAND-LINE OPTIONS

       xscreensaver-demo accepts the following command line options.

       -display host:display.screen
               The  X display to use.  The xscreensaver-demo program will open
               its window on that display, and also control  the  xscreensaver
               daemon that is managing that same display.

       -prefs  Start  up  with the Advanced tab selected by default instead of
               the Display Modes tab.

       -debug  Causes lots of diagnostics to be printed on stderr.

       It is important that the xscreensaver and  xscreensaver-demo  processes
       be running on the same machine, or at least, on two machines that share
       a file system.  When xscreensaver-demo writes  a  new  version  of  the
       ~/.xscreensaver  file,  it’s  important  that the xscreensaver see that
       same file.  If the two processes are seeing  different  ~/.xscreensaver
       files, things will malfunction.

ENVIRONMENT

       DISPLAY to get the default host and display number.

       PATH    to  find  the sub-programs to run.  However, note that the sub-
               programs are actually launched by the xscreensaver daemon,  not
               by  xscreensaver-demo  itself.   So, what matters is what $PATH
               the xscreensaver program sees.

       HOME    for the directory in which to read and write the  .xscreensaver
               file.

       XENVIRONMENT
               to  get  the  name of a resource file that overrides the global
               resources stored in the RESOURCE_MANAGER property.

       HTTP_PROXY or http_proxy
               to get the default HTTP proxy host and port.

UPGRADES

       The     latest     version     can     always     be      found      at
       http://www.jwz.org/xscreensaver/

SEE ALSO

       X(1),             xscreensaver(1),             xscreensaver-command(1),
       xscreensaver-getimage(1), xscreensaver-text(1)

COPYRIGHT

       Copyright © 1992, 1993, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
       2005  by  Jamie Zawinski.  Permission to use, copy, modify, distribute,
       and sell this software and its documentation for any purpose is  hereby
       granted without fee, provided that the above copyright notice appear in
       all copies and that both that  copyright  notice  and  this  permission
       notice appear in supporting documentation.  No representations are made
       about the suitability of this software for any purpose.  It is provided
       "as is" without express or implied warranty.

AUTHOR

       Jamie Zawinski <jwz@jwz.org>, 13-aug-92.

       Please let me know if you find any bugs or make any improvements.