===== How Do I Display Something When Logged In and Something Else When Logged Out? =====

This is pretty easy and there's already an example of it a few places within the default design.  Use the following Smarty code:

<code>
	{if not $logged_in}
		{*Logged out code*}
		<!-- any html/smarty code you want to display when logged IN to your Geo software -->
             You are logged in
	{else}
		{*Logged in code*}
		<!-- any html/smarty code you want to display when logged OUT your Geo software -->
             You are logged out
	{/if}
</code>

You can choose to display something only when logged in or only when logged out and do nothing with the "other side".  Many want a login form within specific templates but don't want to display a login form when you are already logged into the site.  This helps with that and many other things to fit your needs.