I have a wired system. The two computers can access the Internet through DSL. The main computer hooks directly into my router and has a few firewalls. The ancient subsidiary windows 98, 2Gig computer does not have a firewall. It has a network card that hooks into the router. My DSL also hooks into the router. I don’t know if I can find a firewall product for Windows 98 and I don’t know if it needs one? What do you think?
If this helps, I had dial-up until yesterday and only my main computer had access to the Internet. Every piece of malware known to the human race downloaded onto this computer and it took a dozen products to clean it up.