###Keyword###
#include-once

###Description###
Specifies that the current file may only be included once.

###Syntax###
<b>#include-once</b>


###Parameters###
None.


###Remarks###
If you include the same file containing a user-function more than once, you will get a "Duplicate function" error.  When writing an include file that may be used in this way, make sure that the top line contains <b>#include-once</b> to prevent that file from being included more than once.


###Related###
<a href="include.htm">#include</a>, <a href="../functions/FileInstall.htm">FileInstall</a>


###Example###
@@IncludeExample@@
