Danon - are you still on the TFRs list from faa.gov? From one of their links I got to this news, of interest to owners of both computers and telescopes like yourself!
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The amateurs generate TLEs for classified satellites by monitoring military launches, which cannot be hidden, and then spending the time necessary to spot their payloads. Based on precise timings of multiple satellite passes, hobbyists around the world, using computers and their own custom software, can calculate a TLE.
"This measure, like so many security measures taken post-9/11, is completely ineffective in improving security,".....
http://spaceflightnow.com/news/n0503/02observing/index2.html
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N.B. TLE = two-line elements, the data needed to determine any satellite's orbit