multithreaded multidevice app problems

I apologize to those that subscribe to the forum on Nabble for the double post here.  There seems to be more traffic here and I have not had any replies on Nabble

I am trying to update a application that I wrote a few years ago that used OpenAL.  The original app provided a DIS network radio capability for a single user.  I am trying to support up to 4 users on 4 USB headsets.  The application is multi-threaded with each USB headset operating in a different thread.  Each thread creates its own instance of OpenAL so it has it's own device and context.  If I turn on a single channel everything works ok.  If I turn on a second channel the first channel stops working and the second one starts working.  When I turn off the seconed channel the first one does not start working until I turn it off then back on.    In searching the web I found messages that said a process can only have one context.  Does that apply to the whole process or should a thread act
 ing with it's own instance of OpenAL and it's own headset work?  One of the goals is to receive a single message from the network and have all 4 users hear the message at the same time. 

Bruce

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