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<title>SWI-Prolog 7.3.6 Reference Manual: Section 6.10</title><link rel="home" href="index.html">
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<h2 id="sec:resmodules"><a id="sec:6.10"><span class="sec-nr">6.10</span> <span class="sec-title">Reserved 
Modules and using the `user' module</span></a></h2>

<a id="sec:resmodules"></a>

<p>As mentioned above, SWI-Prolog contains two special modules. The 
first one is the module <code>system</code>. This module contains all 
built-in predicates. Module <code>system</code> has no import module. 
The second special module is the module <code>user</code>. This module 
forms the initial working space of the user. Initially it is empty. The 
import module of module <code>user</code> is <code>system</code>, making 
all built-in predicates available.

<p>All other modules import from the module <code>user</code>. This 
implies they can use all predicates imported into <code>user</code> 
without explicitly importing them. If an application loads all modules 
from the
<code>user</code> module using <a id="idx:usemodule1:1583"></a><a class="pred" href="import.html#use_module/1">use_module/1</a>, 
one achieves a scoping system similar to the C-language, where every 
module can access all exported predicates without any special 
precautions.

<p></body></html>