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How to take screen shot
Mac: Command+Shift+3
The screenshot will be saved on your desktop
Windows:
1-Press the Print Screen key
2-Click Start, click Accessories, and then click Paint.
3-In the Paint window, click Edit, and then click Paste.
4-When the image appears in the Paint window, click File, and then click Save As.
5-In the Save As dialog box, in the File name box, type a name for the screen shot, and then click Save.
iPhone:
1-Press the Home and Sleep buttons at the same time
2-Screenshot will be saved in "Photos"