HackNet Software modules are INT-based weapons that act like psi weapons, but only inside HackNet. Software does not require aiming time; if your cursor is over the target from when you click until the shot is fired, you are at full accuracy. However, this makes it harder to judge their maximum range until you figure it out on your own. No one I know seems to know what the difference is between regular and MultiLink versions of the same software.
Causes damage to the target.
Heals the player character (only!) target.
Reduces incoming damage.