X-Cart:Using as a simple "Add to cart" button
When you do not need X-Cart product catalog
If you have already created a website containing pages where your products are listed and advertised to your visitors, then you might want not to use the X-Cart's ability to generate Product catalog and Product pages. Instead you may want to insert Add to cart and Checkout buttons into your existing pages.
Inserting "Add to cart" buttons into your web site pages
X-Cart:Managing_Products#Generating_HTML_links.