in reply to Re^2: Killing a process on Windows (Win32::Process question)
in thread Killing a process on Windows (Win32::Process question)

16000 and counting.

You can look through to find something very specific for your purposes--which would be a damn sight easier if they would put them all on one searchable page.

A couple that might be suitable that I already encountered before are: 

ERROR_CONTROL_C_EXIT 572 (0x23C)
ERROR_FATAL_APP_EXIT 713 (0x2C9)

[download]

Generic enough that they aren't likely to be confused with any "expected values"--specific enough to suggest something abnormal happened.

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In Section Seekers of Perl Wisdom