Conerting monitor's normal screen into touch screen

I jusy came across the topic in formu discussion at URL : http://www.techulator.com/forum/350-How-make-personal-computer-into-Touch-Screen-mode.aspx

I then googled the matter and came up with answers the finds and one or 2 web sites are as under

(i) Search result - Google

http://www.google.co.in/search?hl=en&client=firefox-a&hs=xN&rls=org.mozilla%3Aen-US%3Aofficial&q=convert+your+monitor+into+touch+screen&aq=f&aqi=&aql=&oq=&gs_rfai=

(ii)Commercial way to DIY (do it yourself)at some cost.

http://www.pclaunches.com/monitors/magictouchs_touchscreen_kit_changes_your_regular_monitor_into_a_touchscreen.php

(iii) By attaching some devices etc - this is what the member who posted at url in the beginning was needing I think.

http://answers.yahoo.com/question/index?qid=20070918004403AAs7Gj3