As Zoogie points out, you can use "nul" (or even "/dev/nul"). In NT, you can use ">nul" and "2>&1", but you can't use "&".

But you can do any of these:

system(1,"dyana >nul 2>&1");
system("start dyana");
# something with Win32::Process
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        - tye (but my friends call me "Tye")