There is a system of similar products' presentation in the on-line catalogue. Information about the fact whether a product has got any substitutes is placed within the product frame, under the prices.
To display the information about all similar products (prices, technical description, availability) click the "see" link.
You can also check in the on-line catalogue if a given product is a substitute for another one. In this case, a list of products, which can be replaced by the given product, will be displayed beneath the technical description.
Some products can be similar to others and at the same time they can have their own similar products.