Hi Frédéric,

> -----Original Message-----
> From: Frédéric [mailto:ufosp...@gmail.com]
> Sent: Thursday, October 12, 2017 10:24 AM
> > There is no need to worry about such interference: the environment is
> > private to the process and is inherited from whatever process started it.
>
> Is this true on all OS (Windows, OSX and Linux)?
> If so, I just call putenv at the beginning of my program, that's simple.
>
I know it is true for Linux and OSX (as UNIX descendants). On Windows the 
situation may be less straightforward if you include system-defined environment 
variables, but I have been forced to restart some program that would start 
other programs more than once, because the changed environment was not 
automatically copied into the child processes. If somebody else has evidence to 
the converse, I will stand corrected :).

Regards,

Arjen

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