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<p>set to an appropriate value.</p>

<p><big>In DOS</big></p>
<p><a href="page.php?w=DOS">DOS</a> is not a <a href="page.php?w=computer_multitasking">multitasking</a> operating system, but replacing the previous executable image is essential due to harsh <a href="page.php?w=primary_memory">primary memory</a> limitations and lack of <a href="page.php?w=virtual_memory">virtual memory</a>. <a href="page.php?w=Exec_%28system_call%29">The same API</a> is used for overlaying programs in DOS and it has effects similar to ones on POSIX systems.</p>

<p><a href="page.php?w=MS-DOS">MS-DOS</a></p><p>
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