"updateInvite" in /flash/modules/im/inc/actions.php queries the database, here's the relevant code. Comments to follow.
$rResult = getResult("SELECT `SenderID`, `Message` FROM `" . MODULE_DB_PREFIX ."Pendings` WHERE `RecipientID`='" . $sRspId . "'" . $sBlocked . " ORDER BY `ID` DESC");
//--- if there is a message return it and some information about it's author ---//
while($aMsg = mysql_fetch_assoc($rResult))
{
$aUserInfo = getUserInfo($aMsg['SenderID']);
$sContents see more .= parseXml($aXmlTemplates['message'], $aMsg['SenderID'], $aUserInfo['nick'], $aUserInfo['profile'], $aMsg['Message']);
}
$rResult = getResult("SELECT `SenderID`, `Message` FROM `" . MODULE_DB_PREFIX ."Pendings` WHERE `RecipientID`='" . $sRspId . "'" . $sBlocked . " ORDER BY `ID` DESC");
//--- if there is a message return it and some information about it's author ---//
while($aMsg = mysql_fetch_assoc($rResult))
{
$aUserInfo = getUserInfo($aMsg['SenderID']);
$sContents see more