Answer this question: what is a .PAC file?
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Answer: A PAC file contains a JavaScript function "FindProxyForURL(url, host)".

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

Answer this question: how is rfid tag powered?
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Answer:
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).