[MERGE] Add documentation for hooks

[Aaron Bentley]

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James Westby wrote:
> On (29/08/07 16:07), Aaron Bentley wrote:
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>> Hi all,
>>
>> This patch adds some documentation on hooks.  I needed to find out more
>> about hooks, and I couldn't find any documentation, so I wrote some.
> 
> Hi Aaron,
> 
> This looks good and is well needed, however there is something that I
> didn't quite understand.

I didn't understand it either.  I just copied it verbatim from the code.

Aaron
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