If you don’t have any particular program to take screenshots of the whole screen or specific windows, you may press the “Prt Scr” button on your keyboard at any time, then open MSPaint program, select “Edit” -> “Paste” and the screenshot will appear on your screen. Edit it, save it in jpeg to compress it a bit and then upload it in some image sharing sites, like http://www.flickr.com/ . Finally post here the link of the uploaded picture.