What is the difference between a plasma screen and a LCD screen?

Q. The LCD TV in my room has the same screen the LCD monitor on the computer I am using right now has.
There is a plasma TV in the living room and I the screen feels and looks totally different.

A. The technology used for creating the image in a LCD and a Plasma is different, hence why the picture would indeed look different, there are pro's and con's to each technology.

Original Question

What is the most inexpensive way to add a touchscreen add on to this?

Q. I want to make a sony CPD-M151 lcd monitor have touchscreen. It is a 15.1" diagonal where do I get an inexpensive USB touchscreen add on?

A. This is the one is use

http://www.acer.com/monitor_technologies/eng/touch.html

you can Google or Yahoo yourself for best price.

Here's another option

http://gizmodo.com/246852/navisis-laptop-tablet-every-laptops-a-tablet

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