  Wearable-HOWTO.
  Lionel, trollhunter Bouchpan-Lerust-Juery <trollhunter@lin-
  uxfr.org>

  v0.0.5, December 1999

  Nomadism is one of the major trends of our society, now most of the
  people can work with a laptop computer, but few did the next step: to
  live, or if you prefer to wear one computer that is a wearable.
  ______________________________________________________________________

  Table of Contents






















































  1. Foreword

  2. What is a Wearable anyway ?

  3. Copyright, Disclaimer and Trademarks

  4. Advocacy

     4.1 Why ?
     4.2 The Wearable concept is not a revolution, it is just an evolution.
     4.3 The Wearable may give its user an edge.
     4.4 The Wearable concept: a stealth menace.
     4.5 Wearable computing: an emerging industry.

  5. What CPU ?

     5.1 PDA based Wearables
     5.2 PC/104 and laptop based Wearables.
        5.2.1 What is PC/104 ?
        5.2.2 What about PC/104-plus ?
     5.3 Misc

  6. Power supply

  7. OS

  8. The Sulawesi project.

  9. Input

     9.1 Variations around the keyboard
        9.1.1 Mini keyboards
        9.1.2 One hand keyboard.

  10. Audio Output

  11. Visual Output

     11.1 Head Down displays.
        11.1.1 Wristwatch type
        11.1.2 PDA type
     11.2 Head UP displays
        11.2.1 Obstrusives displays
           11.2.1.1 Hacks with LEDs
           11.2.1.2 Sony GLASSTRON
           11.2.1.3 The VRD ( Virtual Retinal Display )
        11.2.2 Nonobstrusives displays

  12. Comms

  13. How can I have my Wearable ?

     13.1 Commercial Solutions.
     13.2 Do it yourself.

  14. PalmPilot and its clone  ( IBM, HandSpring, TRG ): a new breed of wearables.

  15. How to carry my wearable ?

  16. Applications with Wearables.

     16.1 In the army now.
     16.2 At the hospital
     16.3 With the firefighters
     16.4 Wearable for the disabled.

  17. A borg's life.

  18. Sources of Information

     18.1 Non commercial
     18.2 Commercial.

  19. To do List.

  20. Revision History

  21. Thanks and Credits



  ______________________________________________________________________

  1.

  Foreword

  I am not a guru in wearable computing, simply after some years using
  HP95LX and HP200LX palmtop computers more like  wearables than like a
  PDA ( thanks to DOS 5, the HP200LX even allowed me to do a semester CS
  project using turbo pascal while commuting in the subway ),  and
  living with a palm III and a laptop running Linux, to me the next step
  is having a wearable running Linux, thus I have spent more than a year
  reading various informations on wearable and taking a little part in
  the wear-hard mailing list. As more an more people will be interested
  in the wearable concept I have decided to start this HOWTO in order to
  help them ( At the time of this writing I am building my own wearable
  using my laptop ( Toshiba 430CDT ) with a twiddler keyboard,
  emacspeak, and camcorders batteries. )

  Some people may, at least, be surprised to find the "In the army now"
  section so I would like to explain my position: I am trying to write
  this HOWTO both as a journalist and a scientist would do: this implies
  as a journalist to look for information from every source available,
  and as a scientist to be neutral: and as the US Army is willing to
  purchase more than 30.000 units one can hardly overlook this user
  group.  This document is  intended to be the starting point of a long
  term work. If you have any information ( that can be checked ) that
  you think is of interest, do not hesitate contact me.




  2.  What is a Wearable anyway ?

  Well, as it name implies a wearable is a computer you are supposed to
  wear, actually very few wearables fill this definition. On a more
  practical point of view one can define a wearable as a computer you
  can use on the run relying only on its  power supply ( see the power
  supply section for more information ). So with such a definition PDAs,
  palmcomputers, customized laptops are wearables too.

  I am not a specialist in wearables, simply I have a very strong
  interest in nomadic computing and I studying a lot its implementations
  both from a technical point of view and from the way nomadic computing
  is going to change our every day life and the way we interacts as we
  are getting more and more connected.

  This text is included in the LINUX DOCUMENTATION PROJECT
  http://linuxdoc.org/LDP <http://linuxdoc.org/LDP> .


  The latest version of this document is available in HTML format at
  http://infonomade.linuxfr.org/Wearable-HOWTO.html
  <http://infonomade.linuxfr.org/wearable/Wearable-HOWTO.html>, you can
  retrieve the sgml format at  http://infonomade.linuxfr.org/Wearable-
  HOWTO.sgml <http://infonoamde.linuxfr.org/wearable/Wearable-
  HOWTO.html>

  I will maintain the French version too. If you wish to mirror it or to
  translate it, please contact me.

  Lionel, Trollhunter Bouchpan-Lerust-Juery <trollhunter@linuxfr.org> or
  at <boucli27@altavista.net>


  3.

  Copyright, Disclaimer and Trademarks

  Copyright (C) 1999 by Lionel, trollhunter Bouchpan-Lerust-Juery. This
  document may be distributed under the terms set forth in the LDP
  license at http://linuxdoc.org/LDP/COPYRIGHT.html
  <http://www.linuxdoc.org/LDP/COPYRIGHT.html> .

  This is free documentation. It is distributed in the hope that it will
  be useful, but without any warranty. The information in this document
  is correct to the best of my knowledge, but there's a always a chance
  I've made some mistakes, so don't follow everything too blindly,
  especially if it seems wrong. Nothing here should have a detrimental
  effect on your computer, but just in case I take no responsibility for
  any damages incurred from the use of the information contained herein.

  In this document you will encounter some commercial products and
  brands. Theses products are cited for information purpose, it is not
  an endorsement from the author. The trademarks belong to their
  respective owners.


  4.

  Advocacy

  Some people may want to know why you want to build a wearable or you
  may have to sell your idea to the people who are responsible for the
  purchase.  Here are some ideas you may use.


  4.1.

  Why ?

  Because, you want to experiment by yourself, because you think that
  Human Computer Interaction is not a matter of designing the n-th
  windowmanager, because you feel that enhanced reality is the cutting
  edge of your evolution.



  4.2.

  The Wearable concept is not a revolution, it is just an evolution.

  Some people are afraid of revolutionary or so called products, thus
  the good news is that the wearable may look like a revolutionary
  concept but it is actually just an evolution of the computing
  hardware.  Let me explain that : At first there was the Mainframe,
  then came the desktop computer enabling people to work in their
  office, latter the PC enabled these people to work at home too, as
  time passed the portable PC enabled people to work in a Hotel room, or
  everywhere they could find a power plug ( yes an Osborne or an IBM's
  convertible were definitively not laptop computers ), at the same time
  some pocket computers appeared on the market : Sharp PC1500, Canon
  X07, Casio PB100 then the first one weighted less and less, the second
  one disappeared but the LCD screen was, with other things their legacy
  allowing the laptop to emerge, as the laptop went mainstream, its size
  went smaller allowing people to work in the train, at the library ...,
  then palmtop PC's such as the HP95LX and PDA's appeared, ( at this
  time the most successful is the PalmPilot family and its clones )
  allowing people to work on the move, so the wearable is just the next
  step in this move towards miniaturization.  ( If you want to learn
  more about Laptops and Linux you should read the Laptop-HOWTO, the
  latest version can be found at Werner's Heuser Homepage
  <http://www.snafu.de/~wehe/index_li.html> )

  4.3.

  The Wearable may give its user an edge.


  In today's competitive world it is very important to get an edge over
  the other company, thus for example in a plane repair company the
  engineers who are using wearables do not waste time in asking for
  blueprints but instead have the blueprint and the technical data at
  will while performing their job, thus they will be able to repair the
  planes faster. You may choose an example in your job.


  4.4.

  The Wearable concept: a stealth menace.

  When they made their first appearance on the market, some products or
  technologies were, to say the least, less than perfect. This is a
  stealth menace, if you read Clayton Christensen's book "The
  innovator's dilemma: when new technologies cause great firms to fail"
  or Andy's Grove "Only the paranoid survives" you will see that some
  corporations that relies on a product and that have a king of the hill
  may fall down because they overlooked a new product/technology that
  was clumsy at its beginning and was at first in a market niche, then
  the contender took over the market.


  4.5.

  Wearable computing: an emerging industry.

  The people who decide to fund your project are not always very found
  about technical details, thus you will have to use other arguments,
  otherwise your pet project will be sent to /dev/null.  If one reads
  again chapter 2 of AP Sloan's book: "My years with General Motors" it
  is obvious that the Wearable industry is going into the same changes
  as did the automobile industry in the US at the turn of the century :
  it turned from a Hobby with some small manufacturers to a mass market
  Industry. It took nearly 30 years to the automobile industry to
  change, but the wearable industry should have done this changes in
  less than 5 years, so if they don't invest on this product others will
  do.


  5.

  What CPU ?

  5.1.

  PDA based Wearables

  Usually they use non Intel CPU ( except the HP95/100/200LX ) See the
  PalmPilot : a new breed of wearables section.


  5.2.

  PC/104 and laptop based Wearables.

  Theses devices are using usually an Intel or Intel compatible CPU.


  5.2.1.

  What is PC/104 ?

  PC/104 is an industrial standard, for PC based systems that can be
  stacked together in order to create an embedded system.  The footprint
  of theses boards is 4"x4" so as you can see it is a good base in order
  to start a wearable project.


  5.2.2.

  What about PC/104-plus ?

  It is a PCI addition to the PC/104 standard.  you can read the PC-104
  FAQ <http://www.controlled.com/pc104faq>

  5.3.

  Misc

  Last year there were some alpha based Multia sold for around $100, but
  it seemed AFAIK that nobody ever managed to build a wearable around
  one of theses devices.


  6.

  Power supply

  There is plenty of choice as long as you use batteries. But be careful
  __NEVER__ use liquid acid filled batteries it is a Health Hazard for
  this application.

  7.

  OS

  For the people whose Wearable is based on a PDA, there is little
  choice : most of the time they have to do with the PDA's manufacturer
  OS, AFAIK Linux on Psion series 5 is not mainstream.  a commercial
  solution called WindStone primary targeted to palmpilots with a
  project to port it to ARM based computers it is made by OSK
  <http://www.oski.co.kr/>, so wait and see


  For those using a PC derivative, the choice seems to be between
  Microsoft products or Linux, Well,  Microsoft products are not exactly
  the best choice and DEBIAN/GNU Linux is the winner ( I don't think
  that for general purposes one has to use a posix .4 compliant kernel
  ).
  There is another contender QNX <http://www.qnx.com>, but is more
  industrial oriented, so for hobby or research it is not the best
  choice.


  8.

  The Sulawesi project.

  This project deals as well with input modalities and with output
  modalities thus its section is just before the Input/Output part of
  this document.

  It is meant to accept input from different modalities and to do its
  input to a number of different modalities, this is written in Java;
  The good news is that it is highly portable, the bad news is that
  today a JVM is a memory and resource hog ( but, to me, Java and the
  related technologies such as Jini, just like the wearable, is a
  stealth menace ).  One of the nice features of this project is the
  fact that, because of a clever design, it can deal with with a great
  input and output modalities that exists today, and when new modalities
  one hadn't even think about will be available, it should be able to
  deal with them in a very short time and with little effort.

  Today, can accept input from a GPS too.  You can find more information
  at : Sulawesi Home Page <http://vasewww.essex.ac.uk/projects/>

  9.

  Input


  9.1.

  Variations around the keyboard


  9.1.1.

  Mini keyboards

  Usually theses devices are on the wearer's forearm or wrist.

  The WristPC <http://www.pfuca.com/products/hhkb/hhcindex.html>
  Keyboard  and the Arm mount micro keyboard
  <http://www.ivpgi.com/1accessory.htm> from the Phoenix Group Inc.  are
  typical from this concept.


  9.1.2.

  One hand keyboard.

  IMHO it is the best concept because it doesn't require you to look at
  the keyboard while typing is the less intrusive when you have to deal
  with other people, and in order to be accepted by other a Wearable
  wearer's must have the lowest visual signature.

  The archetype of this concept is the Twiddler <http://www.handkey.com>
  and all of its clones.






  10.

  Audio Output

  When your system doesn't output too much data, or in order to signal
  some special events an audio output can do the job.  Most laptops come
  with a Sound Blaster compatible sound card and a lot of PC-104 cards
  are sold with such a sound card on board or you should buy a sound
  module. The next step is to redirect your text output to a
  text_to_speak program.

  As a lot of input is done using emacs, it seems to be a good idea to
  use  Emacsspeak
  <http://www.cs.cornell.edu/home/raman/emacspeak/emacspeak.html>



  11.

  Visual Output



  11.1.

  Head Down displays.

  11.1.1.

  Wristwatch type

  Some manufacturers ( eg Seiko, Citizen, Casio ) manufactured
  Wristwatches that could be linked to a computer, ( I remember that in
  1982 Seiko showed a prototype of a wirstwatch TV ( monochrome LCD )).

  It is also possible to use a 4 lines LCD display connected to the
  serial port of your laptop ( numerous paper or online electronics
  magazine offer schematics ).


  11.1.2.

  PDA type

  PDA's seem to be a cheap and efficient way of sending and displaying
  data for a wearable, actually any PDA with a VT100 emulation program
  and a serial link can be used effectively as a terminal ( I have
  successfully used my HP200LX running

  kermit  <http://www.columbia.edu/kermit>

  as a terminal for my desktop, giving me an emergency access to it if
  the display failed )


  11.2.

  Head UP displays

  The distinction between obstrusives an non obstrusives ones is not
  from the wearer point of view but from the other people, that is is
  the display forbid to see the wearer's eyes




  11.2.1.

  Obstrusives displays


  11.2.1.1.

  Hacks with LEDs

  Some people managed to use blinking LEDs in order to retrieve
  information from their device. This is one of the simplest display one
  can imagine : a LED or a row of LED blinking.


  11.2.1.2.

  Sony GLASSTRON

  Sony sells a device called the Glasstron


  11.2.1.3.

  The VRD ( Virtual Retinal Display )

  With this device a LASER LED draws the image on the wearer's retina,
  the US Navy tested it in the summer 1999, at Hawaii ( see in the army
  now ).

  11.2.2.

  Nonobstrusives displays

  The Microptical  <http://www.microopticalcorp.com>corporation
  manufactures two displays the Integrated Eyeglass display and the
  ClipOn display.

  12.

  Comms

  AFAIK Most of the time it is with a radio link, should it be with a
  radio transceiver or via a cell phone.


  13.

  How can I have my Wearable ?


  13.1.

  Commercial Solutions.

  Some companies sells Wearables ready to use out of the Box, hereafter
  is a list of them.


  o  Genesys Technology  <http://www.genesistech2000.com/product.html>
     manufactures a Wearable that uses a HMD display.

  o  handsfreemobile  <http://www.handsfreemobile.com> sells the Mid
     Riff Brain, it is mostly an LCD touchpad based solution and the
     unit is in a pouch fixed on the waistband.


  o  Teltronics  <http://www.teltronics.com/is/hardware.html > sells the
     Mentis. It is a modular wearable.

  o  Via  <http://www.flexipc.com/ > sells the VIA II PC a Wearable that
     is worn on the waistband.

  o  Xybernaut  <http://www.xybernaut.com/ > sells the Mobile Assistant
     IV ( MA IV )

  13.2.

  Do it yourself.

  As wearable computing is in its very early beginning you should make
  various experiments and share them with your peers.  Doing this with
  an open and versatile OS such as Linux should give you a lot of fun (
  after all, desktop computer is just a plain vanilla computer), because
  you play with both the OS and the hardware.  If you are unsure of the
  technical decisions you are going to make, you can start with a proven
  design such as the

  Lizzi  <http://wearables.www.media.mit.edu/projects/wearables> design
  and then change some components.  Thus you will not have to reinvent
  the wheel and you will avoid some pitfalls.


  14.

  PalmPilot and its clone  ( IBM, HandSpring, TRG ): a new breed of
  wearables.

  The PalmPilot family and its clone is a hit among PDAs, but less known
  is the fact that it is more than a PDA it is one of the first off the
  shelves wearable.  You can connect it to your cell phone, When on the
  move you may need an input device more convenient than Graffiti: a
  keyboard for example, one device exists that allow you to plug a PS/2
  keyboard in your palm: Happy Hacking cradle Specially for the Palm.

  PFU <http://www.pfuca.com/products/hhkb/hhcindex.html> Happy Hacking
  sells a PS/2 adapter for the Palm, thus one should be able to hook any
  PS/2 keyboard on this device.  It is battery ( 2 AA ) powered.

  It seems that someone has managed to get a twiddler keyboard working
  with the PalmPilot.  If you want to do land navigation it exists an
  electronic compass you can plug into your palm it is called Palm
  Navigator and it is manufactured by Precision Navigation
  <http://www.precisionnav.com> They even sell a weather station.

  If you have more money to spend or want more precision you can
  purchase a GPS receiver called Earthmate; it is manufactured by
  Precision Navigation <http://www.delorme.com> Some of you may want a
  software only solution: this can be done.  If you have some highly
  specialized needs like commuting without having the subway map and
  want a readily made solution you can use a program like Route Expert,
  I use it on a daily basis, it works great with Paris's subway and I
  will test it with Berlin's subway at the end of the year ( of course
  it exists other programs but this one is the one I am using ). I guess
  everyone can find the North using the sun and a wirtswatch, a
  PalmPilot can do it with more precision using readymade programs such
  as T.J's Sun-Compass ( once again there exists other programs but this
  one is the one I am using ).

  The most important with the PalmPilot for the Linux community is the
  fact that there exists two ports of Linux for it ( DragonBall is a
  member of the 68000 family after all ). One is GPLed

  You can find more information at : uClinux <http://www.uclinux.org>

  the second one is commercial, it is based in Korea.  WindStone
  <http://www.oski.co.kr> it is based on uClinux and it is coming  with
  its own GUI and widgets.

  Thus with the next generation of Palms, the CPU speed will be twice
  today's speed, and with Linux on board we will be able to run a lot of
  software that are hardware independent and have been written for
  today's x86 Linux based wearables.



  15.

  How to carry my wearable ?

  Depending on your wearable's family ( eg Palm, palmtop computer,
  laptop based, PC/104 ) there seem to be 3 convenient ways of carrying
  it around.  You can carry it on tour wrist, or in a backpack or you
  can hang it on your waistband.


  16.

  Applications with Wearables.

  As a rule of thumb the first people who are going to use extensively
  the wearables are the people whose work is a matter of life and death.


  16.1.

  In the army now.

  It is very important in an army to have an edge other the enemy, that
  is what we have always seen in history, and moreover the army is known
  to spend vast amount of money in order to get this edge.

  Some years ago the infantryman was ordered to carry different  pieces
  of ordnance that came from different sources and were not part of a
  whole thing, and to try to do his best with theses ( looks like
  Frankenstein to me ). With theses new projects the infantryman is the
  centerpiece of a coherent, complementary weapons and equipment system.


  o  French Forces.

     In France there is a project called FELIN ( Fantassin a Equipement
     et Liaison Integrees ( Foot soldier with integrated equipment and
     links ) )

     in order to enhance the efficiency of the soldier a set of devices
     had been developed with very careful limitations : historically the
     foot soldier has been a beast of burden, thus the FELIN project
     wishes to limit its load at 25kg. The soldier has got a radio link,
     a computer and a camera on his weapon ( allowing him to open fire
     from cover ). The display is done  with a monocular HMD.

  o  UK Forces.

     The FIST ( Future Integrated Soldier Technology ) project: Early
     tests were conducted on Salisbury Plain to determine if the soldier
     could access information either 'Head Up' ( in a helmet display ),
     'Head Down' ( on a wrist mounted display ), via a palmtop computer
     or if necessary  a map
     lessons learned ( in L'armement issue 67 September 1999 )

  o  There is no scope for enhancing soldier performance through the
     provision of tactical information unless the soldier can access
     information 'on the move'

  o  The preference, both by day and night was the helmet display.

     The FIST Digitization Trials will be conducted on Salisbury Plain
     in June and November 2000. The June trial addresses information
     flow, the November trial will address the benefits of enhanced
     information to determine if there is a consequent increase in the
     'Tempo of Operation'.

  o  US Forces


  o  The land warrior program

     It is a system made of 5 subsystems cooperating together.

  o  A Pentium Computer/Radio Subsystem (C/RS) made by Motorola
     featuring an integrated GPS receiver

  o  The Protective Clothing and Individual Equipment Subsystem (PCIE)
     made by Gentex

  o  The Weapon Subsystem (WS) made by Raytheon

  o  The Software Subsystem made by Raytheon

  o  The Integrated Helmet Assembly Subsystem (IHAS) made by Honeywell

     The location of each squad member will be available through the
     IHAS, as well as digitized maps and tactical information.  Every
     soldier will have an integrated GPS as well as video recording
     capabilities.  Of course the soldier will have night vision
     capability as well as deported sighting. Tests should take place
     during year 2000.  More info on the Land Warrior program at

     http://www.sbccom.army.mil/programs/lw/index.htm
     <http://www.sbccom.army.mil/programs/lw/index.htm >

     ( There is even a FAQ and pictures ).  AFAIK this is going to be
     the biggest test for the wearable concept because the Army is
     planning to purchase 34000 units plus spares.

  o  The navy.

     During the summer 1999 news poured that the US Navy tested the
     Virtual Retinal Display at Hawaii. The explanation is that there
     doesn't seem to be enough space in the fighting ships because of
     the numerous CRT, so it is conceivable for the crew to wear VRDs

     Needless to say, that some very low profile and highly specialized
     units should have adopted the wearable concept but as far as we
     cannot have evidence we can only speculate on that.

  16.2.

  At the hospital

  The Microvison <http://www.mvis.com>'s VRD has been delivered
  <http://www.prnewswire.com/cnoc/exec/menu?127059> to the Wallace
  Kettering Neuroscience Institute, Dayton Ohio, for neurosurgery
  applications.  This is not a full featured wearable solution but it is
  a big step toward the adoption of wearables in health care activity.



  16.3.

  With the firefighters

  Firefighters are using thermal cameras in order to see through the
  smoke, in the next years theses devices should be miniaturized and
  with a wearable firefighters should have both hands free and will have
  real time access to data such as the map of the building and numerous
  helpful informations.


  16.4.

  Wearable for the disabled.

  One can easily think that a wearable computer can be very helpfull for
  the disabled people, for example for blind people a wearable with a
  GPS receiver, some maps of the surroundings and even more, interacting
  with its surroundings by means of active beacons can be a very good
  substitute for a dog, the elements exists for a long time.

  This should be easily done : the linux comunity has good text to
  speech applications, voice recognition is quite ready for this
  application , the IrDA or Modem radio drivers are OK, the same applies
  to the GPS programs, we have to develop an electronic blind walking
  stick in order to detect the obstacles at a much reater range and
  last, but not the least to convince the autorities.


  17.

  A borg's life.

  This section deals with Human-Human interaction.  As the wearable is
  quite new for the layman one has to expect some strange reactions from
  the other people.  When I go out and read my PalmPilot's screen while
  walking or in the subway people have one of the following reactions :

  o  No reaction: because they are in their own world or because they
     don't care.

  o  Curiosity: they come to me and ask me questions like "what it is",
     "what are you doing with it" and "how much does it cost ?"

  o  Disdain : they may think I want to draw attention.

  o  Hostility/Fear : "this guy is nut: avoid him".

     Steve Mann Gave an interview in the New Scientist magazine and as
     he was one of the first to test the waters, so he has a long
     experience in this field.  The second problem is that the
     wearable's hardware is quite expensive and some predators will spot
     a new device that can be easily stolen and sold at a good price, or
     just in order to have one of them.  As a conclusion you have to be
     very cautious.


  18.

  Sources of Information


  18.1.

  Non commercial


  A good starting point to gather information is to subscribe to the
  wear-hard@haven.org mailing list, you have to send a message with the
  word subscribe in the subject to wear-hard-request@haven.org.

  The archive of this mailing list is mirrored at Wearable Central
  <http://wearables.blu.org> This site was founded to be an archive
  center for the mailing list and the newsgroup.  It is maintened by R.
  Paul McCarty.


  18.2.

  Commercial.

  You can find information on the web sites of the company cited in the
  various sections of this document and as stated earlier in this
  document : The companies quoted here are just for your information
  only, I do not endorse any of their product, this just in order to
  help you.


  19.

  To do List.

  This section is about things that have to be done for the next
  releases if you wish to contribute it is a good place to look at.

  o  To review more in depth the sulawesi project.

  o  Organic Leds are very interesting, I should cover theses too.

  o  To expand the input/visual output sections.

  o  To expand and reorder the advocacy section.

  o  To have an "in the car" section.

  o  The concept of an UW wearable seems viable lets think about it.

  o  List and describe all projects.

  o  List and describe all products.

  o  To get some sleep.


  20.

  Revision History


  o  v 0.0.5 December 1999, first release.

  o  v 0.0.1 November 1999, first draft.

  21.

  Thanks and Credits


  I would like to thank among other people:

  o  Werner Heuser <wehe@snafu.de> <mailto:wehe@snafu.de> for the work
     he has done maintaining his Laptop-HOWTO
     <http://www.snafu.de/~wehe/index_li.html>

  o  The people of the Wearable mailing list which proved to be very
     informative and open minded.

  o  My friend Manu for his never ending patience and kindness.

  o  The people of the Wearable community whose discussion and web sites
     strengthen my confidence in the wearable concept.





















































