Rather than rely on a commlink's OS to get high system and firewall ratings, a hacker can opt to buy seperate system and firewall programs each up to rating 6. The prices for these programs are listed on page 321 and their descriptions are on page 225. A rating 5 system and firewall would each cost 2,500

. It is also possible to upgrade the response and signal ratings of a commlink according to the 'hardware upgrade cost' table on page 240. A response at rating 5 would cost 4,000

and a signal at rating 5 would cost 1,000