With the Altaform Router, each URL path is treated like an island, a code path
entirely independent from any other URL's code. This means when you load the
page /one/, the code for /two/ is never even loaded, let alone parsed or
executed.
The Altaform Router works nearly identical to a classic file system based
router, such as a traditional Apache + PHP installation. When you request the
URL /one/, the Altaform Router will attempt to load the local file
/one/_index.php.