The following code is in the middle of my theme.html page from a theme I installed, and.. being a newb, I don't know what kind of code it is... doesn't look like PHP, as there is no <?PHP around it... nor does it appear to be javascript, as it vanishes when it is executed... which I'd expect server-side, such as PHP, to do...

All it does is display, "Howdy UserName..." if you are logged in.

=================
<{if $xoops_isuser}>
<font color="#EEEEEE"
Howdy...
</font>
<a href="<{$xoops_url}>/user.php" style="color: #EEEEEE; font-weight: bold;">
<{$xoops_uname}>
</a>
&nbsp;&nbsp;&nbsp;
<a href="<{$xoops_url}>/user.php" style="color: #EEEEEE; font-weight: bold;">
&nbsp;&nbsp;&nbsp;
[ your account ]
</a>
<{else}>
<{/if}>
=================

http://smarty.php.net