One hacked iPhone can in theory be made to target another, forcing it to take photos, share contact lists, or even dial phonecalls without the owner's consent, a particular problem since "always-on" EDGE access means this can be done any time an iPhone is not powered down. Compounding the danger is that mDNSResponder, also known as Bonjour, ZeroConf and Rendezvous, runs by default. The service broadcasts a user's hostname over Wi-Fi, giving hackers a target; it is noted however that active discovery of hostnames may not be easy. The weblog poster observes that some modifications allow the installation of the Metasploit Framework, which in turn can be made to load iPhone executables. This however does not constitute an exploit by itself, since it is left up to other coders to determine the minute details of breaking into other phones.