Locking Your computer remotely using you Android
you can remotely lock Linux, Windows and MAC
and only remotely unlock Linux.
you can download the Desktop Version from here
https://drive.google.com/folderview?id=0BzKLb-Q5X_sbZG02Wk5zVHpBdHc&usp=sharing
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on here
https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=K6LDUCNMK7E9L&lc=IL&item_name=Personal¤cy_code=USD&bn=PP%2dDonationsBF%3abtn_donateCC_LG%2egif%3aNonHosted