Enquiry on the use of "Blackbox".

Date:         26 Dec 97 03:29:06 
From:         Goh <goshel@singnet.com.sg>
Organization: Singapore Telecommunications Ltd
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I was just wondering what data does the flight recorder, commonly known
as the "blackbox", contain?  And is it true that it will emit certain
signal so as to make the search for it easier? Do  all the airliners
have "blackboxes" installed on them?
I will be real glad if someone could answer the above questions, thank
you.

Derek Goh