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What is in wired memory?

Recently I bought a MacBook Pro Core i5 with 4GB Memory (RAM).

After using Xcode and quitting it, all of my memory is committed and I have only 100 MB of free RAM.

So I closed all of my remaining apps, but RAM usage is still high and I don't had much free memory.

What's happening? And what is the meaning of Wired in system memory?

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