Screenshots can be done easily by pressing the "Prt Scr" button next to the Scroll Lock button and above the Insert button. Then go to your favourite graphics program (check out
www.gimp.org for a good free one) and then paste the screen shot into a new document.
In Microsoft's Photo Editor (comes with Office), you just go to file and select "Paste as New Image", or in Gimp you go to the file menu and select "Acquire" and then "From Clipboard". I think in Photoshop you have to open a new document, which will automatically suggest the dimensions of the image in the clipboard, then go to the edit menu and select "Paste Into" or something like that.
To save the document, the best results will come from cropping the image to show only the relevant details, then saving the image as a jpeg with fairly high compression (GImp or Photoshop do the best job here - Microsoft Photo Editor is awful at compressing). Reducing the resolution and using low compression isn't as good as leaving the resolution high and using high compression.
Rygle.