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I learned to use sockets on Android and created a simple app. Not sure about the stability of his work.
You can control the presentation using the volume buttons on the smartphone and the button on the headphones.
Presentation remoteManage your presentation with your smartphone
Tab Keeper is an extension which allows you to quickly save your browser's open tabs in order to open them all later
Tab KeeperAn extension to save all the tabs in a browser session