top right on the key board

Prt Scr
SysRq

http://i.ehow.com/images/GlobalPhoto/Articles/2253481/printscreen_Full.jpg
whatever screen you happen to have up on your monitor, even several cascaded windows, the print screen, will copy it all as an image.

Then open WORD, PAINT or a photo editor program and either right click paste or Ctrl and V keys or edit paste. Drops the entire image into the document or application.

Then use appropriate tools to edit the image.