Nowdays, I obeserved some online website selling laptop in cheap price with good configuration but with Pre-installed DOS OS. as far as i know, dos is command line utility in all window version(98,xp,7,8). How it become OS. if it is OS ....how it will look...how one can login, how one can type doc, xls or even simple web-browsing (as i know in window, it is black screen called cmd).. I am very cuirous to know about it. if any screen shot or video of Dos is available, post the link. PS: I am used to use window 98 then xp,7, and then Now 8.