Customizing a local network

I try to manage a small network for a non-profit committee -

All computers are Dells running XP Home.

Last week I happened upon an option switch that declared I could allow access to the entire network or restrict it to my own local sub-net. I have been unable to locate that switch again. Can someone guide me to it ??? Also, it would help if you would include a bit of information explaining why I should or should not use it.

Thanks much, Ted

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Ted Scherbel
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