Thanks Grandfather, right, I'm using a USB/RS-232 device.
Hmm. No simple solution... I had a feeling this might be the case.
I was just reading through the Win32API::CommPort docs, there is a section for Raw Win32 system API, but none of it seems to be useful for me.
Maybe I can have a separate listener Daemon just start and stop the PortObj Daemon. When the Daemon gets stopped it can release whatever lock is in place. I'll have to try and find a Windows machine at home to test this theory.

In reply to Re^2: Win32::SerialPort ; close / open problem by philipMac
in thread Win32::SerialPort ; close / open problem by philipMac

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