Now from you twitter account your could send various commands as twits on to your system which it would recognize the command and act upon. There are two application that i am sharing below.
1. TweetMyPC : Using with a user can then initiate the shutdown, restart of logoff the system by updating the status at

2. TweetMyMac : This more for Mac users, using this tiny application you can remote control your macbook. Infact this has more additional command options, some interesting ones are listed below.
a. iSight - Snaps an image from your Mac's iSight camera. Your Mac will then reply with the picture posted on TwitPic.
b. open [App] / quit [App] - Opens/Quits the application. You do not need to specify the apps path, but you must enter it's full name, eg "open Address Book".
c. screensaver - The screensaver will be activated on your Mac.
All the above with other basic commands like shutdown, restart, sleep, etc..
You could download the TweetMyMac application from
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