What is the question to: "A PAC file contains a JavaScript function "FindProxyForURL(url, host)"."? The topic is Proxy auto-config.
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Answer: "what is a .PAC file?"

What is the question to: "Though best known for its customer relationship management (CRM) product, Salesforce has also expanded into the "social enterprise arena" through acquisitions."? The topic is Salesforce.com.
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Answer: "what does salesforce.com do??"

What is the question to: "Others use a local power source such as a battery, or else have no battery but collect energy from the interrogating EM field, and then act as a passive transponder to emit microwaves or UHF radio waves (i.e., electromagnetic radiation at high frequencies)."? The topic is Radio-frequency identification.
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Answer:
"how is rfid tag powered?"