Original sentence: Most newer systems, such as Apple Computer's Mac OS X and Microsoft's Windows XP crash less often; they do not need to be totally restarted in the event of a freeze.Usually, in systems with a modern operating system, the user is able to terminate the program's running (for instance, with the "kill" Unix command, or through the "end task" button on the task list in recent versions of Microsoft Windows), and, if they wish, restart it in the hope that the anomalous condition that caused the freeze does not recur
Edited sentence: If it should freeze anyway, then it's easy to kill the process like on other UNIX systems.Mac OS X is presumably the most stable operating system on the market today.Newer systems like Apples MacOS X is almost never freezing in the meaning that the work can't continue without restarting the computer.Usually, in systems with a modern operating system, the user is able to terminate the program's running (for instance, with the "kill" UNIX command, or through the "end task" button on the task list in recent versions of Microsoft Windows), and, if they wish, restart it in the hope that the anomalous condition that caused the freeze does not recur