Multiple Pages - Same Reccord

[webfoo]

Me: idiot
Project: complicated

Problem:

PAGE A: Updates a database with inital info (ip, date, etc). Writes a form, which submits to Page B.

PAGE B: Supposed to write more info to the same reccord as Page A.

How can I capture which record id Page A writes to, so that Page B can write to the same reccord.

[cameraman]

$result = mysql_query('SELECT LAST_INSERT_ID() AS lastinsertid FROM table_name');
if ($row = mysql_fetch_array($result)) {
$id = $row['lastinsertid'];
}

Then, personally, I'd save the id in the SESSION instead of sending it out to the world with the form.