DPR currently supports one instance of DPR running per client machine and all connecting to a shared database. It would be desirable if DPR were to support multiple jobs being run at the same time from the one machine. This could be through multiple instances of DPR or one instance handling multiple concurrent jobs.
Just to add to my grumblebum type comments today. Another semantic nit to pick.
You currently CAN run multiple instances of DPR on one machine. However, you must use different usernames for each instance.
Obviously multiple usernames for one user is not ideal - changing things so you don't have to resort to such trickery is a good idea.