Screen Shots
Windows PC ALT-PrintScr (to clipboard) and Paste
To press the PrintScreen key may also require pressing a Fn (function key) like shown here.
Windows 7 PC SNIPPING TOOL is great!
Windows 7 PC Problem Steps Recorder is neat too!
http://www.google.com/search?q=problem+steps+recorder+windows+7
Mac (worked on pre-Mac OS X too )Nice link from Apple: http://www.apple.com/findouthow/mac/#capturescreen
Shift-Command-3 : Whole Screen to a desktop file
Shift-Command-4 : Selected area to a desktop file
Control-Shift-Command-3: Whole screen to clipboard (then Paste)
Control-Shift-Command-4: Selected area to clipboard (then Paste)
or
The Grab utility. Timed screenshots and more
or
The command line screencapture command
Sources:
Linux
http://www.google.com/search?q=screen+shot+linux
Three Ways To Capture Screenshot In Ubuntu Linux
http://www.addictivetips.com/ubuntu-linux-tips/three-ways-to-capture-screenshot-in-ubuntu-linux/