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<p><a href="page.php?w=Windows">Windows</a>, <a href="page.php?w=UNIX">UNIX</a>, and <a href="page.php?w=Linux">Linux</a>. Software upgrades usually require setting up the <a href="page.php?w=operating_system">operating system</a> or portions thereof, and are non disruptive only when using <a href="page.php?w=Virtualization">virtualizing</a> facilities such as IBM <a href="page.php?w=z%2FOS">z/OS</a> and <a href="page.php?w=IBM_Parallel_Sysplex">Parallel Sysplex</a>, or Unisys XPCL, which support workload sharing so that one system can take over</p><p>
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