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system 'cmd.exe /c notepad.exe' || die 'no notepad';
# is the same as
...
system( 'cmd.exe /c notepad.exe' ) && die 'no notepad';
# or you could do
system 'cmd.exe /c notepad.exe' and die 'no notepad';

0 == system 'cmd.exe /c notepad.exe'
    or die 'no notepad';