Is a Reverse data flow possible in Acrobat Forms

Why yes, there is. Although you need to either write some code, spend some money, or spend some time. Data can be imported into PDF in a number of different ways. You can manually import an XML or XDP data file in Acrobat Pro with the "Forms > Manage Form Data > Import..." menu item. You can also drag and drop a data file onto the Open PDF in Acrobat or Reader. You can write an Automation script to import the data. You can setup the LiveCycle form to import the data directly from an XML or Database file. And you can write an automation script to import records from a DB file and automatically send the files out through email. And these are just the options using Acrobat Pro on the desktop. If you've got a server you could use ColdFusion to serve up the filled in LiveCycle forms directly to the users. And of course there is always the Adobe LC ES servers, which cost a fortune, but allow you to do just about anything. But like I said up front, pre-populating forms and sending them back to the users takes time, money, and/or programming skills. This is not a feature that's built into Acrobat.If you are into the do it yourself thing, I presented a session on connecting forms to a DB and doing exactly the kind of thing you're asking about, at the PDF Central conference. You can download my slides from here:
http://www.pdfcentralconference.com/pdfcentralconference/evaluations.html

The session was called "Practical DB connected forms"

Thom Parker
The source for PDF Scripting Info
[url=http://www.pdfScripting.com]pdfscripting.com[/url]

The Acrobat JavaScript Reference, Use it Early and Often
[url=http://www.adobe.com/devnet/acrobat/javascript.html]http://www.adobe.com/devnet/acrobat/javascript.html[/url]

Then most important JavaScript Development tool in Acrobat
[url=http://www.pdfscripting.com/public/34.cfm#JSIntro][b]The Console Window (Video tutorial)[/b][/url]
[url=http://www.acrobatusers.com/tutorials/2006/javascript_console][b]The Console Window(article)[/b][/url]