No, the idea is very simple -- I open an empty file for writing and keep it while the program is working. If an instance of the program is already running, I cannot delete it. So, if I try to delete the file and can't (FileType(fname)<>0), this means that one instance is already working, so I quit. If I can delete the file, this means that I'm running for the first time, so, I reopen the file for writing and start the program. This works even if the program crashes or shuts down unexpectedly.
Single copy of BlitzMax program
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