The same way you do on singeplayer - right click the chest. However, if you are referring to a bukkit server or any server with plugins and the chest is locked, there is no way to do it yourself. This is to prevent theft and it works very well. Additionally, there may be server lag. This means that there may be a delay before the chest items appear. Do not worry, the lag will go away soon (hopefully)!
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Yes, Multiplayer comes with Minecraft on the PC.
You need an account to play minecraft multiplayer.
First you start Minecraft, then you go on "multiplayer" and type in an ip !
If u have online, then u should have multiplayer on minecraft