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== Null pointers == Contrary to the zero page's original preferential use, some modern operating systems such as [[FreeBSD]], [[Linux]], [[Oracle Solaris|Solaris]], [[macOS]], and [[Microsoft Windows]]<ref name="msdn"/> actually make the zero page inaccessible to trap uses of [[null pointer]]s. Such pointer values may legitimately indicate uninitialized values or [[sentinel node]]s, but they do not point to valid objects. [[Software bug|Buggy code]] may try to access an object via a null pointer, and this can be trapped at the operating system level as a memory [[access violation]].
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