If I have a page with ID 123, I know my template file
page-123.php will be called to render it, but if my theme is used across a network, could a page in a different site also have ID 123?
I assume, if so, that I'll need to sniff
$current_site and requiring an alternate template file if it's not the site I'm targeting.
I already assume slugs aren't unique across a network.