Javadoc
Lock the current record.
This method responds differently depending on what open mode the record is in:
OPEN_DONT_LOCK - A physical lock is not done. This is usually where deadlocks are possible
(such as screens) and where transactions are in use (and locks are not needed).
OPEN_LOCK_ON_EDIT - Holds a lock until an update or close. (Update crucial data, or hold records for processing)
Returns false is someone alreay has a lock on this record.
OPEN_WAIT_FOR_LOCK - Don't return from edit until you get a lock. (ie., Add to the total).
Returns false if someone has a hard lock or time runs out.