Just by having your computer connected to the Gnutella network, that makes you a host/peer. The files in your shared folder are available for others to d/load from you. Lime Wire » Glossary - Host/Peer

Try these links for more info:

Lime Wire » LimeWire User Guide

Frequently Asked Questions - LimeWire

User Cant Connect - LimeWire

Lime Wire » Glossary

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