If you have an all-Windows network, this isn't a problem - Windows comes with facility to directly address each other (in the same subnet) with their (netbios) names.
If your machines are Bonjour/Avahi-capable, this is also not a problem - they provide similar functionality to discover name-to-address mapping (and more).
If your machines are none of these; then you will need some mechanism to somehow map the (host)names to their IP addresses, so head to this article.
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