sending only 1 job to cups server

[Matthias Ehrig]

hallo, we use 2 CUPS server for many clients to print jobs with special accounting on these servers, clients use http-backends for this.   Unfortunatly the server queues only 1 job per client and the client must wait until this job is finished, before the next job can be send.
The clients but can reboot to another system, before all jobs are finished. This is a great mistake for us.
Can I configure that all jobs are immediately send to server ?

Thanx's in advance             M.E.