in reply to Check for another running instance of the same program
It's one plausible way... among many. Most of them have occasioned some discussion here. Super_Search and search engines are your friends.
If you didn't program your executable by toggling in binary, it wasn't really programming!
Advising you that x or y or z is the "best" way without a lot more details on your case would be "iffy," at best.
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Seekers of Perl Wisdom