Is there a way to set or update a node's NID?

After some reading and playing with code I figured out a way to do this:

1. Add a CCK field to the content type (I called it "legacy_id")
2. When parsing the upload CSV file save the old ID to this "legacy_id" field
• $node->field_legacy_id[0]['value'] = $legacyID;
3. Before saving the node, see if there is a node that already exists with that legacy_id value. If it does, add the nid from that node to the one we are about to save:
   
   <?php
    $field = content_fields('field_legacy_id');
    $db_info = content_database_info($field);
    //see if the node alreay exists
    $query = "SELECT n.nid FROM {node} n INNER JOIN {". $db_info['table'] ."} a ON a.vid = n.vid WHERE a.field_legacy_id_value = $legacyID";
    $result = db_query($query);
    $exist = db_fetch_object($result);
    if ($exist != NULL) $node->nid = $exist->nid;
?>
4. Save the node (node_save($node);)

I hope this helps someone down the road!