This read-write value returns the index of the next available free row in the fXfrTable and, per the standard TestAndIncr convention, is used to atomically claim that index for a new file-transfer entry. Admins or management stations read then set this object as a locking mechanism to safely create a new file-transfer table row without colliding with another manager doing the same thing simultaneously. A management station reads fXfrNextIndex, gets back 7, and then creates a new fXfrEntry at index 7 to start configuring a new file transfer job.