Yes, some of the most common ways are via radio waves,
satellites and 'photon technologies'
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Windows, Macintosh and most servers offer virtualization
technologies. Microsoft has the VirtualPC software. The Mac can run
most OSes (Windows, Linux) via Bootcamp or through VMWare Fusion or
Parallels.
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Computers are connected via Internet,which is commmonly known as
network of networks. In History,computers were connected via telnet
and various other technologies. But Internet has become popular in
very short time.