Question: Is it possible to connect simultaneously through two modems installed on the pc? 

Answer: Yes. A company called Diamond MultiMedia made a modem years ago called the Shotgun. The idea was, take 2 modems, and 2 seperate phone lines, and combine them inside the computer for faster speeds.\n\nreference: http://www.highbeam.com/library/docfree.asp?DOCID=1G1:19945391&ctrlInfo=Round18%3AMode18c%3ADocG%3AResult&ao=
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