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Please help me clarify with GSM monitoring system (active style and semi-active). I cannot differentiate these 2 types of monitoring systems. If anyone can tell me exactly how they operate? Thank you in advance.

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Hi @gem, welcome to IT Security. This doesn't seem to be a security question, as we would expect from questions on this site... please see the FAQ. If you do have a security-related question here, please edit it to clarify, and then ping me or another mod to reopen it. – AviD♦ Aug 14 '12 at 7:09

closed as off topic by AviD♦ Aug 14 '12 at 7:08

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