Changing the title for the site can be done by editing the includes/languages/english.php file. Locate the following line in that file and change it as you like:
// page title define('TITLE', 'osCosmmerce');If you can't find that code, try looking for the following code instead. This is used in the patched versionsof oscommerce and allows the shops title to be set in admin->Configuration.
Changing the page headings for the home page and the category pages can be done by editing the includes/languages/index.php file. Look for the lines beginning with
define('HEADING_TITLE',There will be three such instances.
If you do the above, the title and page heading for your home page will be as you want. But what about your product pages? There is no simple way to change those since the product pages are controlled by one file. The way around this is to install a meta tagscontribution. Most, if not all, of them will allow you to control the titles and page headings for the entire site. This is important since the title is the first thing the search engines look at when entering your site. If it is not setup correctly, the chances of doing well in the search engine listings is reduced.
As far as what to change the title of the home page to, don't make the mistake of choosing the site name. The title should be the same as the main keyword you are targeting for that page. A keyword is some word or phase that someone will search for using a seach engine. It is very rare for the name of the shop to be searched for so by using that as the title, you are hurting your chances of being found by such searches.