Run Broker 50 and Broker 61 on same Unix box

We have server running Broker Server Release 5.0.1 with a Broker

How do I add a 6.1 Broker to run simultaneously on the same box?
Any ideas?

Broker 6.1 is completely compatible with Enterprise server applications. I would recommend that you just upgrade you broker to 6.1 and continue to run your 4.x/5.0 applications until you have a chance to convert them.

We do that here, and have no problem with it.