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<h1 class="title">Introduction</h1>
<p class="para">
Those functions provide means to execute commands on the
system itself, and means to secure such commands.
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<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
All execution functions call the commands through
<em>cmd.exe</em> under Windows. Therefore the user calling these
functions needs appropriate privilege to run this command. The only
exception is <span class="function"><a href="function.proc-open.html" class="function">proc_open()</a></span> with
<em>bypass_shell</em> option.
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