We are using MNI to spawn multiple instances of a process. Question, how can the

You could pass the parent process id into each sub process and then have them send a message back to the parent with its own id.

thanks tim

I would recommend instead passing a byreference() array of booleans (basically a list of flags, one for each instance you are kicking off) to the subprocesses. The sub-process can then have a rule event that triggers, and then terminates itself, if the flag is set. Without understanding your exact use case, you could determine a way to work with this framework. It would avoid the need to use a lot of process-to-process messaging. Since these processes are directly related, byreference values can be used instead.