>It is in a loop for all records. After 496 records, rlock fails. I can not determine why. It is not ISRLOCKED()...each record is UNLOCKed at the end of each loop iteration.....

On a Novell Server 3.11 the default, as I recall is 500 locks. This is a Setting that can be changed. I don't know what the default is for 4.* Netware.