How to read from and write to remote data file?

Hi there
I have two variables that I would like to store in a remote data file which can be accessed by my Flash file. It is for a voting system, so the first variable would be a counter that is incremented each time a user votes, and the second would be the total rating. The average rating would then be calculated from these.
How would one store, retrieve, and then update these variables from the data file?
I can create the system within a single Flash file for a single session, but obviously I'd like multiple users opening the file simultaneously to be able to access the data and update it.
I'm using AS2 in CS3. Any help would be appreciated.

Right, I've made significant progress since I started this topic. I now have my Flash and php files set up, and the communication between them is working. I'm having difficulty now retaining my variables in the php and updating them for the next session. The script that I have is as follows:
<?
$totalRating1 += $_POST['latestRating1'];
$ratingCount1 ++;
$averageRating1 = $totalRating1 / $ratingCount1;
echo "&averageRating=$averageRating1";
?>
The first line receives the variable "latestRating1" from the SWF. The new average rating is calculated and returned to the SWF as "averageRating". When I run it, however, the variables are reset each time. The average rating is always the same as the latest rating. How can I retain the variables so that they are updated and available for the next user?
Any advice would be appreciated. I am very new to php, and don't have any experience with other scripting languages. I'm using ActionScript2.

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