[IntelMPI/Windows] pmi_proxy console window

On Windows we start localhost MPI (v5.1) jobs using the following command:

mpiexec.hydra.exe -bootstrap fork -envall -np <Nprocessors>  <prog> <args>

If the job is started from a GUI this leads to a pmi_proxy.exe console window popup. Is there any way to get rid of the window? The window serves no purpose in our case because both stderr and stdout are redirected to a file and is very annoying because sometimes multiple jobs are executed one after another. An optional (say via an environment variable) call to FreeConsole() in pmi_proxy would be sufficient for this I believe. 

Alexei