You can use IPC::Open2's open2 or IPC::Open3's open3 to get two virtually independently running processes, until they feel the need to communicate to one another. Check out Win32::GUI Chatterbox client for working sample code.

In reply to Re^3: capturing STDOUT after Win32::Process::Create() by bart
in thread capturing STDOUT after Win32::Process::Create() by bmc_mark

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