Here is a link to a thing that allows you to see how hackers might be able to get into your intranet at home.

[color:#000099][b]SheildsUp[/b][/color]

Yup Steve Gibson has quite a few security tools on GRC.
I let them look me over about once a month.,

Thanks Trumpy. Time permitting I will read all of it.

Shields up will probe all the ports on your computer and see what you are exposing to the internet. It is basically a function of the firewall. An XP system (and beyond) set to the default should be invisible.
If you poke around there it can test other things.