documentation about Horde

[Atif Ghaffar]

Hi.
Where can I find some docs on how to write apps using Horde framework.
Example.
Where can I find documentation on registry.php that explains the syntax
of 

$this->services['imp']['mail']['compose'] = array(
    'callback' =>
"javascript:open_compose_win('popup=1&to=|to|&cc=|cc|&bcc=|bcc|&msg=|msg|&subject=|subject||extra|');",
    'includeFile' =>
'%application%/templates/javascript/open_compose_win.js',
    'invocation' => "<script language='JavaScript'
type='text/javascript'>open_compose_win('to=|to|&cc=|cc|&bcc=|bcc|&msg=|msg|&subject=|subject||extra|');</script>"
);

what are the |constants?
Are they replaced by something.

%application% is obvious but is this also documented somewhere?


thanks.


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Atif Ghaffar
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