how does template caching work?

[flat6]

I'm looking at the following:

PHP Code:

// get special data templates from the datastore
$specialtemplates = array(
    'smiliecache',
    'bbcodecache',
    'banemail',
);

// pre-cache templates used by all actions
$globaltemplates = array(
    'USERCP_SHELL',
    'usercp_nav_folderbit'
); 


It seems that beyond declaring the names of the array, nothing else happens. What am I stupidly overlooking :ermm: