or you PC you should have a key called PrtSc or printscreen
just have what ever you want to show on the PC screen - click on that key - you may have to use a combination of Fn on a laptop or shift etc....
then gointo a image program - like this free one www.irfanview.com and open a new document and paste or use the control key and the V key.
that will paste a picture of your screen into the program - save as jpg and email
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