DORWAY AND ELECTRONIC BUSINESS
In this article, the concept of a doorway is analyzed, procedures for its implementation and use are examined. It is revealed that doorways can use a rather complex and formalized apparatus (Markov chains, Kalman filters, synonymyzing, cloaking, parsing, translators, etc.) and automatically generate unique content and pages that are not diagnosed by the search engines as spam. The classification of doorways into relatively independent groups was studied: "black", "gray" and "white". The importance of category management is determined. The connection between doorways and key stages of site design is considered.