how works forEach?

[Ferraris]

        Hi, 

        I'm dealing with a problem of parallelism. The matter is: when we 
create the actions in modelSwarm (using :[modelActions createActionForEach: 
agentList message: M(step)];) how exactly does Swarm work? 
It sends the messagge "step" to each member in the list without waiting for 
answer or it sends "step" to the first member waiting the agent executes the 
return self before sending the "step" selector to the second and so on? 
In other words the control of the CPU is given to the agent till its "return 
self" or a sort of effective  parallelism is done?  The time needed for each 
model-step would be, more or less, equal to the sum of each agent's step time 
also if I had a multi-processor computer? 
        If anyone could help me many thanks

        Gigi

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