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Your computer may talk to other computers with light, over a glass data highway — fibre optic cabling. Since more and more personal computers and terminals are being connected to larger computer networks with light‐carrying fibre optics, you should know some of the do's and don'ts on how to use them and take care of them. Once you determine that your workstation uses pulses of light to communicate, you can do something to ensure that the light doesn't go out.