Well my brother put on three
and it crashed the computer when I connected to the internet, so now I know why.
Zone Alarm
does have the option to keep it on, so I was wondering why.
[offtopic]I just read an
article and it said there that BlackICE Defender v2.5 ($39.95) was useless, but ZA passed the security test. This will be an old version, but still if you are using that maybe you should get a better firewall...[/offtopic]