This attribute specifies the maximum number of Arbortext PE sub-processes that the Queued Transaction Scheduler can use to execute queued transactions. By default, this parameter is set to -1, meaning that every Arbortext PE sub-process in the pool can be allocated to the Queued Transaction Scheduler. If this attribute is set to 0, then no Arbortext PE sub-processes in the pool will ever be allocated to the Queued Transaction Scheduler. You can set maxConcurrentQueuedTransactions to 0 to dedicate the Arbortext PE sub-process pool to processing only immediate transactions.