fork() on Windows is emulated using threads, so I'm not sure this is the best solution in this situation (as the fork and exec idiom will not work).
One way to start a process asynchronously is to use system() with an initial argument of 1:
if ($^O eq "MSWin32") {
system(1, "cmd_to_run arguments");
}
else {
# do fork and exec, or use system("cmd_to_run arguments &");
}
The system(1, ...) call works at least on OS/2 too, and is "documented" in perlport.
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