Group or usernames "System"

This may be a stupid but easy question....

What is the "SYSTEM" group when identifying security for users on a folder?

I am setting permission security on a folder and the group "SYSTEM" comes up, and I want to know exactly what that means, or is necessary, or why is it there. I cannot find anything on the net about it.
ksharkmanAsked:
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Mike KlineCommented:
SYSTEM is  an account;  Its real name is "NT Authority\Local System" and it has a well-known SID of S-1-5-18. All Windows computers have this account and they always have the same SID. It's there for user-mode processes that will be executed as the OS.


More info on SYSTEM here:

http://support.microsoft.com/default.aspx?scid=kb;EN-US;243330
SID: S-1-5-18
Name: Local System
Description: A service account that is used by the operating system.

Thanks

Mike
briousdCommented:

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