When you click OK, you agree that the program execute a command, or that you have read and accepted a message (this does not solve a problem if there is one). By clicking OK, you remove the message and close the window.
Kadar kliknete V redu, se strinjate, da program izvrši ukaz, ali potrdite, da ste prebrali in sprejeli sporočilo (kar ne reši morebitnega problema). Ko kliknete V redu, odstranite sporočilo in zaprete okno.