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Paul,
use custom event (Insert PHP code snippet option on the Visual Editor tab) for this purpose.

Here is a sample:

global $conn;

$strSQL = "select LinkedField from MasterTableName where RecordID=".$_REQUEST["editid1"];

$rs = db_query($strSQL,$conn);

if ($data = db_fetch_array($rs))

echo "<a href=\"DetailTableName_list.php?mastertable=MasterTableName&masterkey1=".$data["LinkedField"]."\">DetailTableName</a>";