[horde] Question regarding sending an email

[Mike Poznecki]

Hi, I have written a new transport for my email client.  I am having a hard time figuring out how to send some new information that I capture on the Compose window to my Transporter.
Does anyone have a map of what all files are used when launching the email composer?  And a map of the flow after the user clicks "Send"?
It is very hard to follow all the pages that are used.
So far it seems that after the user clicks "Send", /php/Horde/Core/Factory/Mail.php is called.Then, /php/Horde/Mime/Part.php is called.
I'm really just trying to send another form field (from compose.html.php) to be sent all the way to my Horde_Mail_Transport_Mysmtp file.
Thanks.