The page names are given, what you mean to say is that we are not told what names to use as links to the pages.
OOP_properties.php is the page
OOP_properties is the page name
<a href="OOP_properties.php">OOP_properties</a> is a link to the above mentioned page (see code example below)
Well using steps as the links would be inappropriate because step 1 to step 4 have to be done on the same page.
We had a discussion about the names to be used as links in one of my posts and we concluded that the names
of pages will be used as the link names.e.g. OOP_properties would be used for OOP_properties.php
Therefore the link code will be something like:
Language: PHP
<?php
echo ';<a href="OOP_properties.php">OOP_properties</a>';;
?>