AWEsome keyboard!

check this out dudes...The Virtual Laser Keyboard a.k.a VKB. keyboard without key! just bluetooth to connect and there u go. can be used with PDA since ur (n mine) PDA got tiny keyboard.
actually this stuff has been around since 2000.kinda late for now. never mind bout that. the most important, this thing is awesome..yeahh..

type on anywhere.

projecting keyboard!

want it? visit here.

so..how they did that..i mean what is the secret behind it?
shown on the website too.n yes for lazy bums, just read it on my page.

How they do it

Step 1: Template creation (Projection Module)

• The desired interface template is projected onto the surface(for this case,a keyboard image).

• The template is produced by illuminating holographic optical element with a red diode laser.

hey,this step is not involved in detection. just for you to see where's where.

Step 2: Reference plane illumination (Micro-illumination ModuleTM)

• An infra-red plane of light is generated parallel to the interface surface.
  can't see the light plane with naked eyes. and it located just milimeters above the surface.
  

• When the user touches a key position on the interface surface light is reflected from this plane in the vicinity of the key and directed towards the sensor module.

Step 3: Map reflection coordinates (Sensor Module)

• Reflected light from user interactions is passed to a sensor using infra-red filter

• Custom hardware embedded in the sensor chip (the Virtual Interface Processing CoreTM) then makes a real-time determination of the location of the reflected light.

• best part is, it support multiple reactions. so alt+F4 is not a problem.just like old time..

source from:
Power Positioning (2P) Ltd.
http://www.virtual-laser-keyboard.com