If I leave my PC online and ON, for what good purposes can it be used over the internet remotely by me or somebody else? Except for seeding torrents….
Use it to calculate billions of mathematical complicated equations .
hello, like somebody really wise told me once, "If you have to ask what it is used for, you do not need it".
If you don't have a clear need to do it, don't. Unless you like high electricity bills and being vulnerable to attacks, this isn't very wise.
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well, first of all what you can do is -
> access your PC and its contents from anywhere and this set up would also allow you to remotely control PCs, sync folders, share files, and chat securely and easily
and set up your own VPN networks .
enabled with help of apps and clients like - TeamViewer , LogMeIn Hamachi , Tonido ,
OpenVPN , GBridge .
>Set up your own SSH Tunnel for safe internet access from any where .
check this good tutorial on how to do this . http://lifehacker.com/205090/geek-to-live--set-up-a-personal-home-ssh-server
>create your own P2P community , only sharing files between and among users who you trust and want to share with using GigaTribe http://www.gigatribe.com/en/home
>Create a Media Center PC and make it your Entertainment hub and also Wirelessly stream music and other media in your place .
check this tutorial to see how - http://lifehacker.com/5700741/the-airplay+alternative-guide-to-streaming-your-media
some i could think of at the moment . .. :)