Thanks again,
Does seem implementing the startDetached() is the better option ( if i understand correctly) as when the app closes , closing down the started sup processes could be problematic.

On a side note:
Needing to keep the instance around is also an interesting complexity, if logic serves,

The app starts a process (perhaps stored in a QList Or QHash) Maintain the state so when the sup-process terminates i can ether re-use the process or remove the process and create another instance .
*with the understanding that if the main app closes all sup-process's will close.

Is the logic sound?