The Function key plus F2 will lock the computer. Press it again to unlock the computer.
See the manual http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/43Y6632_09.pdf
SOURCE: how to reverse an image
this will require software
go to web and search for picture software
here is a link to one I found
http://picasa.google.com/
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