How do I use a variable from one module in a template from another module?

I want to put the total number of users (from Members -<{$lang_totalusers}>) at the bottom of the New Members Block (System). If I just add the <{$lang_totalusers}> in the template it shows nothing. After a search I tried:

<?php
global $lang_totalusers;
echo "$lang_totalusers";
?>

in the template, but that gave nothing. Can you point me to the docs for this - of course they have all changed today

Does nobody know how to do this or is it just too obvious...

The value that's stored in the variable is calculated by code in the Member's module (modules/xoopsmembers/index.php). To use the variable in a different module, you would need to duplicate that calculation.