In order to successfully create appropriate names for the page title in an osCommerce website, you must edit two important files and the corresponding important pages of the website.

1. Index.php - This is the most important template file in osCommerce. This template is responsible for generating titles for the home page and category pages. 
   
   
2. Product_info.php - This template is responsible for naming the title tag for the product pages. This template can cause very serious problems. In a giant osCommerce site with thousands of products, using this template unmodified also means there are thousands of pages with the same titles.

Other pages are not as important as the two above, but it is very important that they also use unique and relevant page titles. The pages are found in the main site navigation menu. For example:

• New Products page: products_new.php
  
  
• Special offer page: specials.php
  
  
• Contact us page: contact_us.php
  
  
• Privacy Policy page: privacy.php

You should also modify other pages that are commonly found if you have them, such as the terms and conditions page, sitemap page and "About Us" page.

We'll start with the index.php since this is a very important file. By default, the title tag PHP script found in the index.php is:

<title><?php echo TITLE; ?></title>

This is not enough. It will produce a home page title equal to the store owners' name, or the name of the store, which will not help with search engine optimization efforts.

It gets worse. The page title on the categories pages will be the same as the one on the home page and even the product pages! 

This can confuse visitors shopping your online store powered by osCommerce; even search engine bots like Googlebot will have problems sorting things out. Your site will be very hard for them to understand, and in return, since you confused Googlebot, you will not be rewarded with great rankings and traffic.