php what is the use of __

Hey all have a very noob question.

What is the use of __ in my functions.
For example this book shows __construct() which obviously happens when the class is started. But then it has
__set
__get

Is there a list of these functions somewhere. Kinda confused on the use of them.
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aumudinAsked:
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Chad SmithSoftware EngineerCommented:
Here is a list of php functions
http://us3.php.net/manual/en/language.functions.php
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aumudinAuthor Commented:
None of which that I see use the __

I am looking for what the use of __ is whats it do etc... And if there is a list of these functions that USE the __
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Chad SmithSoftware EngineerCommented:
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aumudinAuthor Commented:
Thank you that helps.
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