Component Services User Thread Pool
A thread from the Component Services user thread pool is allocated to a transaction as long as the host is processing the transaction (unit of work time). This occurs for both transactional (two-phase commit transactions), and nontransactional processing. If you have slow host or communication lines, or your transactions take a long time to process, you might have to adjust a registry entry to enable more threads for this pool. The default is 100 threads per COM+ application.
See Also
Transaction Programs that Run for a Long Time
Transaction Integrator Performance Guide