The agency's devices monitor thousands of telephone circuits, cable lines and the microwave transmissions that carry an increasing share of both spoken and written communications.

电脑程序监视着那些触发词或短语，这些词或短语表明一条信息可能会引起情报分析员的注意。当一个触发词或短语出现的时候，整个信息就会被录下来或者打印出来。