Headley often gave the following example of the use of psychological subversion:  Suppose the hacker needed access to a certain classified military computer called, say, IBAS. He would obtain the name of the base commander or other high-ranking official, gain access to the DNS network, (which is the separate military telephone network) and dial up the computer center he needed to reach, which was often in a secured facility.
Headley often used an example of psychological exploitation:  A hacker might attempt to obtain access to a classified military computer called IBAS by identifying a key figure, gaining access to the DNS network, and making contact with the relevant computer center, usually situated in a secure environment.