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puff(1X)							      puff(1X)

NAME
       puff - An X program for sight-impaired users

SYNOPSIS
       puff [-toolkit_option] [-option]

OPTIONS
       Have  Puff's  false  server  listen  at a different display number.  By
       default, Puff listens to display number 1.  Set the magnification  fac‐
       tor.   The  magnification  is constrained to be an integer greater than
       zero.  The default is 6.	 Specify in milliseconds how often  to	update
       the  Puff  window  in the absence of pointer of graphics activity.  For
       example, to update every second, use a  value  of  1000.	  The  default
       update  rate  is	 500  milliseconds,  or 2 Hz.  An update value of zero
       turns off periodic updating.  Specify the size of  the  pointer	cursor
       block  in  the  Puff  window. The actual dimension of the block is '2 *
       cursorWidth * magnification'. The default cursor width is 3. The	 width
       of  the	view  box outline is `cursorWidth + magnification'.  Display a
       short command summary.

DESCRIPTION
       Puff (puff) is intended for people who need text and graphics displayed
       at  a  high  magnification  factor.  Typically users will want both the
       pointer and text to be tracked as they work.

       Puff follows the pointer (also known as the mouse), magnifying  a  part
       of  the screen under the cursor.	 In addition, Puff can monitor the X11
       protocol of X clients and magnify the region where graphics  were  last
       drawn.	By  monitoring	a program like xterm, Puff can follow the text
       cursor automatically.  Puff switches  focus  between  the  pointer  and
       graphics, depending on which was last active.

       In  order  to  track  the  protocol  of X clients, Puff sets up a false
       server on the machine that it is	 executed  on.	 This  server  is,  by
       default, at display number 1.  Any X clients connecting with this false
       server are connected to the same X server that Puff  is	connected  to.
       Puff is transparent to X clients.

       Puff  draws  a  box around the location being magnified, which makes it
       easier to track the cursor and see where Puff is	 focusing  its	atten‐
       tion.  The view box flashes on each update.

INTERFACE
       Puff  is	 controlled  via  the keyboard.	 The following keys have these
       actions: Change the magnification factor	 to  2-18,  20,	 25,  and  30,
       respectively.  Toggle showing the view box.  Quit Puff.	This will also
       finish off any clients running through Puff.

       The following arrow key commands make it easier to scan text and graph‐
       ics:  Move  the magnification window up by 1/4 the window height.  Move
       the magnification window down by 1/4 the window height.	Move the  mag‐
       nification  window  right by 1/4 the window width.  Move the magnifica‐
       tion window left by 1/4 the window  width.   Return  to	the  point  of
       interest.

ADDITIONAL RESOURCES
       The  following  resources  apply to the Puff widget, of class puff: Set
       the magnification factor in  the	 horizontal  direction.	 The  resource
       value  must be a positive integer.  Set the magnification factor in the
       vertical direction.  The resource value must  be	 a  positive  integer.
       Graphics and pointer activity are accumulated for delayMin milliseconds
       before Puff updates to avoid overwhelming the X	server.	  To  decrease
       Puff's  impact,	increase  delayMin.  The default value is 50 millisec‐
       onds, or 20 Hz.	If the viewBox resource is nonzero, the view box  will
       be drawn.

EXAMPLES
       In  practice,  Puff is used on the top half of the screen, with clients
       running on the bottom half.  A sample file might read:

       #!/bin/csh xrdb -load $HOME/.Xdefaults xclock -geometry -10-10  &  puff
       -geometry 1280x500+0+0 & xterm -display :1 -geometry 80x32+5-5 & twm

       For  an	example	 of  how Puff follows the display, enter the following
       command after starting Puff:

       xclock -display :1 -u 1

CAVEATS
       If run over a network, Puff can consume a good portion of an Ethernet's
       bandwidth.   To	be a good citizen, run Puff on the same workstation as
       the X server whenever possible.

       If available, Puff will use the MIT Shared Memory X  server  extension,
       which  greatly  improves	 performance.	However,  if  terminated  with
       extreme prejudice (that is, kill -9),  the  program  will  not  have  a
       chance  to  release the shared memory segments it was using.  The ipcrm
       program can be used to free up Puff's mess.

       Puff will grab all Ctrl	arrow-key  events,  depriving  other  clients.
       This obnoxious behavior should be made an option.

AUTHOR
       AHPCRC (Army High Performance Computing Research Center)

SEE ALSO
       X(1X)

								      puff(1X)
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