Thank you so much for your answer. So if I understand it correctly, the router will not accept a computer on the network if the MAC address has not been given to the settings.

Now the ssid. I think this is the name of the network. What you suggest is making this name invisible to other users, in fact to all users including myself. Right ?
So no-one can be tempted to get on my network because it “isn’t” there. In the settings I see ssid broadcast enabled. So if I disable that, the network becomes invisible for others, still we (our computers) will be able to connect.

Can I ask another question? The way I understand is Firewalls are ways to close ports so nobody can get into your computer.
What I don’t understand is if I have a firewall how come I can get out, like mail and internet. Doesn’t that imply that there must still be some doors, ports, open ?
And if I’m still correct, if it is so dangerous to leave all ports open, why aren’t they set closed by default?

Anyway, I’m glad about your answer about MacIntosh Addresses. It shows again how far ahead the Mac is since every computer uses it. VIVA APPLE INC !

______________________________________________________________________________

I konw tihs isn’t ture, I jsut wnaetd to chgane soemnoe’s boold prussere.