Was bitte ist eine Semaphore?

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Da will ich doch frischfröhlich auf ein Netzlaufwerk zugreifen, als plötzlich obige seltsame Meldung auftaucht. Was hat das zu Bedeuten? Hab mal nachgeschaut, da steht irgendwas von wegen „Synchronisation von Zugriffen auf kritische Ressourcen“?! Hilfe, gibts irgendwo ein Buch „Understanding Windows Errormessages“?

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