Active directory - computer display name

Why does thecomputer  "display name" in Active Directory have a "$" at the end of the name?
Actually, not all of the names have the "$" but if I know why it is there, maybe I can figure out why some do not have it.
Farmer900Asked:
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caddladyCommented:
It could either be the computer accounts are Pre Windows 2000 or a script might have been run to add machines accounts to the server that appended a $ to the computer name.

Both are good reading:
http://www.microsoft.com/technet/scriptcenter/guide/sas_srv_kzbv.mspx?mfr=true
http://support.microsoft.com/kb/924177
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dhall4bizCommented:
Typically this is (or was back in the old NT days) used to hide a resource (machine, user account, shares, etc.) on the domain when navigating the standard UIs (My Network Connections, etc).
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Windows Server 2003

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